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

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 .

I think: C. 109.9 inches;
Considering that the entire circumference is a semicircle should be only:

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.