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

Answer 1

Is B the correct answer?

Answer 2

I believe so

Answer 3

https://benchprep.com/blog/wp-content/uploads/2012/03/circle-formulas1.jpg

Answer 4

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

Answer 5

b is the answer

Answer 6

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

Answer 7

Thanks a lot!!!

Answer 8

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

Answer 9

wait.... the circumference is just \(\pi \ \ no\ \ ^2\)

Answer 10

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