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Find, to the nearest tenth, the area and the circumference of a circle whose radius is 12.5cm.

User Lizzy
by
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1 Answer

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Answer:

The area is 490.9 cm^2 and the circumference is 78.5 cm

(using a calculator to evaluate π i.e the answer might be slightly different if you use π = 3.14 (lower accuracy) and so on)

Explanation:

The formula for area of a circle is,

A = πr^2

here, r = radius = 12.5 cm

A = π(12.5)^2

A = π(156.25) cm^2

A = 490.9 cm^2 (using a calculator to multiply by π)

The formula for circumference of a circle is,

C = 2πr

so,

C = 2π(12.5)

C = 25π

C = 78.5 cm

User Rohan Bari
by
8.1k points

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