What is radius and diameter if the circumference is 78.8?

What is radius and diameter if the circumference is 78.8?
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1 Answer

Answer :

circumference = π × diameter→ diameter = circumference ÷ π = 78.8 ÷ π = 25.0828... ≈ 25.1unitsdiameter = 2 × radius→ circumference = π × 2 × radius→ radius = circumference ÷ π ÷ 2 = 78.8 ÷ π ÷ 2 = 39.9 ÷ π =12.5414... ≈ 12.5 unitsYou may notice that 25.1 ÷ 2 = 12.55 which would round to 12.6to 1 dp. This shows the importance that rounding is only done atthe final stage; rounding throughout a calculation will lead torounding errors. It was the re-entry of rounded data to a computerprogram that lead to the start of chaos theory.
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