Question

What is the approximate circumference of a semicircle with a radius of 12 centimeters?

Answer 1

Circumference of circle is 2*pi*radius
so 2*3.1416*12 = 75.4 cm
circumference of semicircle would be (1/2) (75.4) = 37.7 cm
answer is 37.7 cm

Answer 2

You do Pi×Radius^2
so 24×Pi=75.4
then 75.4÷2=37.7