explain the diameter of circle p is 15 units long

Question

explain the diameter of circle p is 15 units long

Answer 1

If the diameter of a circle = 15

then the radius = 15/2 = 7.5

and the area = pi(r^2) = pi(7.5)^2 = 56.25pi square units = about 176.71 units^2

the circumference of the circle = pid = 15pi units long = about 47.12