Question

How do you do this ? Can someone explain and help

Answer 1

The circumference is the perimeter of the circle that is equal with
P=2πr(where r is the half of diameter)
P=2π10ft
=20ft
hope it helps

Answer 2

The formula is pi (3.14) times the diameter so...

3.14 x 20 = 60 ft
Good luck!