A semicircle has a radius of 20. What is the approximate perimeter of the semicircle?  Choose the correct choice.
A) 50 B) 25 C) 86 D) 75 E) 102
circumference of a circle =2pi*r   perimeter of a semicircle = pi*r + 2r   aprox perimiter = 3.14*20 + 2*20= 
<gadget id="calculator">3.14*20 + 2*20</gadget>
<output>102.8</output>
102.8 approximately 102   answer 102
<result>E</result>
A semicircle has a radius of 20. What is the approximate perimeter of the semicircle?