Question

Find the exact area of the circle with the given diameter.

d = 12.6 cm

A.

39.69 cm2

B.

158.76 cm2

C.

158.76π cm2

D.

39.69π cm2

Answer 1

you know the formula of a circle, yes?

Answer 2

yes

Answer 3

\[a_\text{circle}=\pi r^2\]\[\qquad=\pi\left(\frac{d}{2}\right)^2\]\[\qquad=\pi\frac{d^2}{4}\]

Answer 4

is it B

Answer 5

not quite, you forgot to multiply it by pi

Answer 6

if you know the formula for the area of a circle, then why are you asking us if the answer is B?

how about you show us your solution eh