A circle has a circumference of 40 cm. Find the area of the circle.

(π = 3.142)

A: 127.49cm²

B: 6.37cm²

C: 20.01cm²

D: 509.90cm²

Correct Answer : A

Using the circumference, we can find the radius using the formulae:
Circumference = 2πr

40 = 2 × π × r

40 = 2 x 3.142 x r

40=6.284r

Divide both sides of the = sign by 6.284 to get r

Hence r = 6.37 cm

Area of the circle :
π r² = A
substituting 

3.142 × 6.37 ² = 127.49 cm²

Area A = 127.49 cm²

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