Question

In circle P, ST = 30 ft. What is the circumference of the circle?

30π ft


15π ft


10π ft


45π ft

Answer 1

30×pi ft

Explanation:

ST is the diameter.

the formula for the circumference of a circle is

C = 2×pi×r

r = radius = diameter / 2

so,

C = 2×pi×30/2 = pi×30

therefore, the first answer option is correct.