Properties of right triangles: 1. The opposite side of the right angle of a right triangle is the hypotenuse. 2. The hypotenuse is the largest arm of a right triangle. 3. When the length of the sides of a right triangle is a whole, it is called 'Pythagorean Triple ' . 4. Apart from right angles of this triangle, the sum of the other two angles is 90 0. 5. If any two sides are known, the length of the other side of the right triangle can be determined. . The right triangle is the basis of Pythagoras' theorem. . All the other arms and angles can be determined if one angle of this triangle and one adjacent to the angle are known. . The ratio of any side adjacent to the right angle of an isosceles right triangle is always 1: 2 –. 9. The legs of an isosceles right triangle , that is, the two arms adjacent to the right angle, are equal to each other, and the hypotenuse is 2–6 times that of any one leg .