Question

What is the approximate circumference of a semicircle with a radius of 35 inches?

A.
1923.25 inches

B.
219.8 inches

C.
109.9 inches

D.
54.95 inches

Answer 1

I think: C. 109.9 inches;
Considering that the entire circumference is
`2 \pi r` a semicircle should be only:
`\pi r=3.14*35=109.9 in`

Answer 2

If it were a complete circle, its circumference would be

(π) x (diameter) = (π) x (2R) = 70 π inches .

Since it's only half of the circle, the length of the curved part is

70 π / 2 = 35 π = 109.9 inches .