Question

what is the circumference of a circle with an radius of 15

Answer 1

radius is 15
diameter is 30 (multiply radius by 2 to get the diameter)

Answer 2

Circumference = pi*(diameter)


pi is approximately 3.14

Answer 3

thanks i have another question

Answer 4

ok

Answer 5

what is the area of a circle with a circumference of 6 pie

Answer 6

you are given the circumference

Answer 7

you need to find the area

Answer 8

the circumference of a circle can also be found using this formula

C = 2*pi*r

r is the radius

Answer 9

if C = 6pi, then what must r be?

Answer 10

3?

Answer 11

correct

Answer 12

then you use that value of r and plug it into the area of a circle formula

\[\Large A = \pi*r^2\]

Answer 13

what is the circumference of a circle with an area of 36 pie

Answer 14

start with the area of a circle formula

plug in A = 36pi and solve for r. What do you get?