Circumference of circle ? -Maths 9th

Circumference of circle ? -Maths 9th
by

1 Answer

Answer :

Circumference of circle is - 2πr
by

Related questions

The circumference of the base of 9 m high wooden solid cone is 44 m. Find the slant height of the cone. -Maths 9th

Description : The circumference of the base of 9 m high wooden solid cone is 44 m. Find the slant height of the cone. -Maths 9th

Last Answer : Circumference of the base of a cone = 2πr

The circumference of the base of 9 m high wooden solid cone is 44 m. Find the slant height of the cone. -Maths 9th

Description : The circumference of the base of 9 m high wooden solid cone is 44 m. Find the slant height of the cone. -Maths 9th

Last Answer : Circumference of the base of a cone = 2πr

The circumference of the base of a cylindrical -Maths 9th

Description : The circumference of the base of a cylindrical -Maths 9th

Last Answer : Height of the cylindrical vessel (h) = 25 cm Let r cm be the radius of the base of the cylindrical vessel. Circumference of the base = 2 πr = 132 cm ⇒ 2 x 22/7 x r = 132 ⇒ r = 132 x 7/2 x 22 = 21 ... 21 x 21 x 25 = 34650 cm3 ∴ Volume of water which vessel can hold = 34650 L/ 1000 L = 34.65 L

How do you work out the centre of a circle when you only know 4 points on it's circumference?

Description : How do you work out the centre of a circle when you only know 4 points on it's circumference?

Last Answer : You only need 3 points to find the center. Here is a hint. The perpendicular bisector of any chord of a circle goes through the center. If you need more help, I will provide it.

find the circumference of a circle 5ft radius?

Description : find the circumference of a circle 5ft radius?

Last Answer : 20

The length of ——ab (the minor arc) is 40 cm. What is the circumference of circle c inside angle is 60 degrees?

Description : The length of ——ab (the minor arc) is 40 cm. What is the circumference of circle c inside angle is 60 degrees?

Last Answer : s = 2 π r (θ/360°), C = πr^240cm = 2πr(1/6)(40*6)/2π = rr = 38.1972cmC = π*(38.1972)^2C = 4,583.66 cm

What is the area of a circle whose circumference is 8π?

Description : What is the area of a circle whose circumference is 8π?

Last Answer : Using 3.14 as Pi the area of circle is: 0

What is the formula for determining the circumference of a circle ?

Last Answer : circle circumference = 2 pi r . Pi = 3.1416 .

Circle Circumference Who Say ?

Last Answer : of the circle Range To length Circumference Says.

How to calculate the circumference of a circle

Description : When the circle has a diameter of 12.5 cm. What will be its perimeter? Thank you

Last Answer : pi x average 3.14159 x 12.5 = 39.27

What is the circumference of a circle with a diameter of 40 millimeters.?

Description : What is the circumference of a circle with a diameter of 40 millimeters.?

Last Answer : 125.66 mm

What is area of a circle if circumference equals pi divided by 2?

Description : What is area of a circle if circumference equals pi divided by 2?

Last Answer : Area of a circle is: pi times radius squared

What is the diameter of a circle with a circumference of 12.25?

Description : What is the diameter of a circle with a circumference of 12.25?

Last Answer : Diameter of circle: 12.25/pi = 3.899 rounded to 3 decimalplaces

What will happen if the diameter of the circle doubles how will the circumference change?

Description : What will happen if the diameter of the circle doubles how will the circumference change?

Last Answer : The circumference also doubles.

What is the tangent line equation of the circle 2x2 plus 2y2 -8x -5y -1 equals 0 at the point 1 -1 on its circumference?

Description : What is the tangent line equation of the circle 2x2 plus 2y2 -8x -5y -1 equals 0 at the point 1 -1 on its circumference?

Last Answer : Circle equation: 2x^2 +2y^2 -8x -5y -1 = 0Divide all terms by 2: x^2 +y^2 -4x -2.5y -0.5 = 0Completing the squares: (x-2)^2 +(y-1.25)^2 = 6.0625Center of circle: (2, 1.25)Point of contact: (1 ... 9Tangent equation: y--1 = -4/9(x-1) => 9y = -4x -5Tangent line equation in its general form: 4x+9y+5 = 0

If a circle has a circumference of 132 inch what is the diameter?

Description : If a circle has a circumference of 132 inch what is the diameter?

Last Answer : Diameter of circle: 132/pi = 42 inches rounded to the nearestwhole number

How do you find the circumference of a circle knowing only the diameter?

Description : How do you find the circumference of a circle knowing only the diameter?

Last Answer : Circumference of a circle: pi times diameter

If the radius of the circle above is 30 mm. What is the circumference of the circle (Use 3.14.)?

Description : If the radius of the circle above is 30 mm. What is the circumference of the circle (Use 3.14.)?

Last Answer : 188.40 mm

Can you draw a circle with circumference 33 cenemeteres?

Description : Can you draw a circle with circumference 33 cenemeteres?

Last Answer : Feel Free to Answer

If r is the radius of a circle and d is its diameter is an equivalent formula for the circumference C 2r?

Description : If r is the radius of a circle and d is its diameter is an equivalent formula for the circumference C 2r?

Last Answer : Circumference of a circle: 2*pi*radius or diameter*pi

What is the radius of the circle if circumference is 132cm?

Description : What is the radius of the circle if circumference is 132cm?

Last Answer : Radius of circle: 132/2pi = 21cm to the nearest integer

What is the circumference of a circle with 56 cm?

Description : What is the circumference of a circle with 56 cm?

Last Answer : Circumference of a circle: 2*pi*radius or pi*diameter

What is the circumference of 23 inch circle?

Description : What is the circumference of 23 inch circle?

Last Answer : Circumference of a circle: 2*pi*radius or diameter*pi

What is a situation where you would need to know the circumference of a circle?

Description : What is a situation where you would need to know the circumference of a circle?

Last Answer : The circumference of a circle would be needed as for examplewhen constructing a circular swimming pool.

What is the circumference of a 12.5 circle?

Description : What is the circumference of a 12.5 circle?

Last Answer : If 12.5 refers to the diameter, then the circumference is 39.3units, approx.

If r is the radius of a circle and d is its diameter is an equivalent formula for the circumference C 2r?

Description : If r is the radius of a circle and d is its diameter is an equivalent formula for the circumference C 2r?

Last Answer : Circumference of a circle: 2*pi*radius or diameter*pi

What is the circumference of the circle if the diameter is 24cm?

Description : What is the circumference of the circle if the diameter is 24cm?

Last Answer : Circumference of circle: 24*pi = 75.398 cm rounded to 3 decimalplaces

If the circumference of a circle measures 1.5 pi cm what is the area of the circle in terms of pi?

Description : If the circumference of a circle measures 1.5 pi cm what is the area of the circle in terms of pi?

Last Answer : circumference = 2πr→ r = circumference/2πarea = πr²= π(circumference/2π)²= circumference²/4π= (1.5π cm)²/4π= (3π/2 cm)²/4π= (9π²/4)/4π cm²= 9π/16 cm²= 0.5625π cm²

What is the circumference of a circle with a radius of 67.5 meters?

Description : What is the circumference of a circle with a radius of 67.5 meters?

Last Answer : The circumference of a circle it Pi times the diameter. Thediameter is 2 times the radius. So the diameter is 135 and Pi is3.1416. So the circumference is 424.115 metres.

What is the approximate circumference of a circle with 17.4 cm radius?

Description : What is the approximate circumference of a circle with 17.4 cm radius?

Last Answer : Circumference of circle: 2*pi*17.4 = 109 cm approximately

What is the straight line which touches the circumference in a circle?

Description : What is the straight line which touches the circumference in a circle?

Last Answer : It is the tangent of the circle

How is the circumference of a circle related to the length of its diameter?

Description : How is the circumference of a circle related to the length of its diameter?

Last Answer : asd

The ratio of the area to the xircumference of a circle is 5/4. What is the circumference of the circle?

Description : The ratio of the area to the xircumference of a circle is 5/4. What is the circumference of the circle?

Last Answer : 1.25

The ratio of the area to the xircumference of a circle is 5/4. What is the circumference of the circle?

Description : The ratio of the area to the xircumference of a circle is 5/4. What is the circumference of the circle?

Last Answer : 1.25

As 'Circle' is related to 'Circumference' in the same way 'Square' is related to what? (A) Diagonal(B) Perimeter(C) Circumference(D) Area(E) Angle

Description : As 'Circle' is related to 'Circumference' in the same way 'Square' is related to what? (A) Diagonal(B) Perimeter(C) Circumference(D) Area(E) Angle

Last Answer : (B) Light

Speed of an object travelling around a circle depends upon A. angular velocity B. radius C. circumference D. both A and B

Description : Speed of an object travelling around a circle depends upon A. angular velocity B. radius C. circumference D. both A and B

Last Answer : both A and B

The 'fix' of a plane table station with three known points, is bad if the plane table station lies (A) In the great triangle (B) Outside the great triangle (C) On the circumference of the circumscribing circle (D) None of these

Description : The 'fix' of a plane table station with three known points, is bad if the plane table station lies  (A) In the great triangle  (B) Outside the great triangle  (C) On the circumference of the circumscribing circle  (D) None of these 

Last Answer : (C) On the circumference of the circumscribing circle 

What is the radius of the circle/ I.Ratio of its area to circumference is >7. II.Diameter of the circle is ≤ 32. If the question can be answered with the help of statement I alone, If the question can be answered with the help of statement II alone, If both,statement I and statement II are needed to answer the question If the question cannot be answered even with the help of both the statements. If the data in either statement I or statement II alone is sufficient to answer the question.

Description : What is the radius of the circle/ I.Ratio of its area to circumference is >7. II.Diameter of the circle is ≤ 32. If the question can be answered with the help of statement I alone, If ... the statements. If the data in either statement I or statement II alone is sufficient to answer the question.

Last Answer : Let the radius of the circle be r units From statement 1: [πr^2]/ [ 2 πr ] > 7 or r > 14 From statement II: 2r≤32 R ≤ 16 Hence, r can be 15 or 16 units Hence, Answer : d

The area of a circle is 154 sq cm. Its circumference is a) 44cm b) 88cm c) 154cm d) 176cm e) 164 cm

Description : The area of a circle is 154 sq cm. Its circumference is a) 44cm b) 88cm c) 154cm d) 176cm e) 164 cm

Last Answer : a) 44cm

Develop a program to find diameter, circumference and area of circle using function.

Description : Develop a program to find diameter, circumference and area of circle using function.

Last Answer : #include<stdio.h> #include<conio.h> void circle(float r) { float diameter,circumference,area; diameter=2*r; printf("\n Diameter=%f",diameter); circumference=2*3.14*r; printf ... :"); scanf("%f",&radius); circle(radius); getch(); }

A chord of a circle of radius 7.5 cm with centre 0 is of length 9 cm. Find its distance from the centre. -Maths 9th

Description : A chord of a circle of radius 7.5 cm with centre 0 is of length 9 cm. Find its distance from the centre. -Maths 9th

Last Answer : ∵ PM = MQ = 1/2 = PQ = 45 cm and OP = 7.5 cm In right angled ΔOMP, using phthagoras theorem OM2 = OP2 - PM2 ⇒OM2 = 7.52 - 4.52 ⇒OM2 = 56.25 - 20.25 ⇒OM2 = 36 ∴ OM = √36 = 6 cm

In the given figure, if chords AB and CD of the circle intersect each other at right angles, then find x + y. -Maths 9th

Description : In the given figure, if chords AB and CD of the circle intersect each other at right angles, then find x + y. -Maths 9th

Last Answer : ∴ ∠CAO = ∠ODB = x [angles in same segment ] ---- (i) Now, in right angled ΔDOB , ∠ODB + ∠DOB + ∠OBD = 180° ⇒ x + 90° + y =180° (using equation i) ⇒ x + y = 90°

Prove that the line joining the mid-points of two parallel chords of a circle passes through the centre. -Maths 9th

Description : Prove that the line joining the mid-points of two parallel chords of a circle passes through the centre. -Maths 9th

Last Answer : Let AB and CD be two parallel chords having P and Q as their mid-points, respectively. Let O be the centre of the circle. Join OP and OQ and draw OX | | AB | | CD. Since, Pis the mid-point of AB. ⇒ OP ... 90° Now, ∠POX + ∠XOQ = 90° + 90° = 180° so, POQ is a straight line . Hence proved

If two chords of a circle with a common end-point are inclined equally to the diameter through this common end-point, then prove that chords are equal. -Maths 9th

Description : If two chords of a circle with a common end-point are inclined equally to the diameter through this common end-point, then prove that chords are equal. -Maths 9th

Last Answer : Let AB and AC be two chords and AD be the diameter of the circle . Draw OL ⊥ AB and OM ⊥ AC . In ΔOLA and ΔOMA ∠ OLA = ∠ OMA = 90° OA = OA [common sides] ∠ OAL = ∠ OAM [given] . OLA ≅ OMA [by ASA congruency] OL =OM (by CPCT) Chords AM and AC are equidistant from O. ∴ AB = AC Hence proved.

A circle with centre O and diameter COB is given. If AB and CD are parallel, then show that chord AC is equal to chord BD. -Maths 9th

Description : A circle with centre O and diameter COB is given. If AB and CD are parallel, then show that chord AC is equal to chord BD. -Maths 9th

Last Answer : O Join AC and BD. Given, COB is the diameter of circle. ∠CAB = ∠BDC = 90° [angle in a semi-circle] Also, AB II CD ∠ABC = ∠DCB (alternate angles] Now, ∠ACB = 90° - ∠ABC and ∠DBC = 90° - ∠DCB = ... = ∠DBC BC = BC [common sides] ΔABC = ΔDCB [by ASA congruency] ∴ AC = BD [by CPCT] Hence Proved.

In the given figure, equal chords AB and CD of a circle with centre O cut at right angles at E. If M and N are the mid-points of AB and CD respectively, prove that OMEN is a square. -Maths 9th

Description : In the given figure, equal chords AB and CD of a circle with centre O cut at right angles at E. If M and N are the mid-points of AB and CD respectively, prove that OMEN is a square. -Maths 9th

Last Answer : Join OE. In ΔOME and ΔONE, OM =ON [equal chords are equidistant from the centre] ∠OME = ∠ONE = 90° OE =OE [common sides] ∠OME ≅ ∠ONE [by SAS congruency] ⇒ ME = NE [by CPCT] In quadrilateral OMEN, ... =ON , ME = NE and ∠OME = ∠ONE = ∠MEN = ∠MON = 90° Hence, OMEN is a square. Hence proved.

The given figure shows a circle with centre O in which a diameter AB bisects the chord PQ at the point R. If PR = RQ = 8 cm and RB = 4 cm, then find the radius of the circle. -Maths 9th

Description : The given figure shows a circle with centre O in which a diameter AB bisects the chord PQ at the point R. If PR = RQ = 8 cm and RB = 4 cm, then find the radius of the circle. -Maths 9th

Last Answer : Let r be the radius, then OQ = OB = r and OR = (r - 4) ∴ OQ2 = OR2 + RO2 ⇒ r2 = 64 + (r-4)2 ⇒ r2 = 64 + r2 + 16 - 8r ⇒ 8r = 80 ⇒ r = 10 cm

In the given figure, O is the centre of the circle, then compare the chords. -Maths 9th

Description : In the given figure, O is the centre of the circle, then compare the chords. -Maths 9th

Last Answer : AB is the longest chord because it is passing through the Centre hence it is a diameter ThereforeAB>CD

AD is a diameter of a circle and AB is a chord. If AD = 34 cm, AB = 30 cm, then find the distance of AB from the centre of the circle. -Maths 9th

Description : AD is a diameter of a circle and AB is a chord. If AD = 34 cm, AB = 30 cm, then find the distance of AB from the centre of the circle. -Maths 9th

Last Answer : ∵ The perpendicular drawn from the centre to the chord bisects it. ∴ AM = 1/2 AB = 1/2 × 30 cm = 15 cm Also, OA = 1/2 AD = 1/2 × 34 cm = 17 cm In rt. △OAM, we have OA2 = OM2 + AM2 172 = OM2 + 152 ⇒ 289 = OM2 + 225 ⇒ OM2 = 289 - 225 ⇒ OM2 = 64 ⇒ OM = √64 = 8 cm

Equal chords of a circle subtend equal angles at the centre. -Maths 9th

Description : Equal chords of a circle subtend equal angles at the centre. -Maths 9th

Last Answer : Given : In a circle C(O,r), chord AB = chord CD. To Prove : ∠AOB = ∠COD. Proof : In△AOB and △COD AO = CO [radii of same circle] BO = DO [radii of same circle] Chord AB = Chord CD [given] ⇒ △AOB ≅ △COD [by SSS congruence axiom] ⇒ ∠AOB = ∠COD. [c.p.c.t.]