Verified Answer :

Anirvin

So :

Area of circle = πr²

The diameter is two times the radius so you would divide the diameter by two.

For example if the diameter was 12cm, the radius would be 6cm. So then :
Area = π(6)²
Area = π(36)
Area = 113.04 cm²
This is an estimated answer because π is an irrational number.

apologiabiology

\([\frac{d}{2}]^{2} = (pi) times ( \frac{d^{2}}{4})= \frac{(pi)d^{2}}{4}\)area=pi times r^2
d=2r
r=d/2
subsitute
pi times \([\frac{d}{2}]^{2} = (pi) times ( \frac{d^{2}}{4})= \frac{(pi)d^{2}}{4}\)

area= \(\frac{(pi)d^{2}}{4}\)

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