A circle has a circumference of 25.12 cm. What is its area? Use 3.14 for π.

A. 4 cm2

B. 12.56 cm2

C. 25.12 cm2

D. 50.24 cm2

Question

A circle has a circumference of 25.12 cm. What is its area? Use 3.14 for π.

A. 4 cm2

B. 12.56 cm2

C. 25.12 cm2

D. 50.24 cm2

anonymous · Answer

Is B the correct answer?

anonymous · Answer

I believe so

jdoe0001 · Answer

jdoe0001 · Answer

the circumference of it is 25.12
the circumference formulat is $2\pi r^2$

anonymous · Answer

b is the answer

jdoe0001 · Answer

so, that means
25.12 = $2\pi r^2  \implies r^2=\cfrac{25.12}{2\pi}$

anonymous · Answer

Thanks a lot!!!

jdoe0001 · Answer

from the Area formula, you have Area = $\pi r^2$
so, use THAT $r^2$ in the Area formula, see what you get

jdoe0001 · Answer

wait.... the circumference is just $\pi \ \ no\ \  ^2$

jdoe0001 · Answer

so, $2\pi r  \implies r=\cfrac{25.12}{2\pi}$