A semicircle has a radius of 10. What is the approximate perimeter of the semicircle?
Choose the correct choice from the following choices.
A) 27
B) 33
C) 39
D) 45
E) 51
The perimeter of a circle is 2*pi*r.   The perimeter of a semicircle is 2*pi*r/2 + 2r = pi*r + 2r   The perimeter is pi*10 + 2*10 which is about 51.   The answer is 51.
<result>E</result>
A semicircle has a radius of 10. What is the approximate perimeter of the semicircle?