The area of a circle is 81π in². What is the circumference, in inches? Express your answer in terms of (Pie)

18 pi inches

Step-by-step explanation:

The area of a circle is

A = pi r^2

81 pi = pi r^2

81 = r^2

Taking the square root of each side

9 = r

We can now find the circumference

C = 2 * pi *r

C =2 * pi *9

C = 18 pi

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: