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what is the best approximation for the perimeter of a semicircle with a diameter of 35 inches?

Use 3.14 to approximate pi.

A. 54.95 in.

B. 89.95 in.

C. 109.90 in.

D. 144.90 in.

Respuesta :

perimeter of a semicircle is calculated as follows;
                                                                           
diameter = 35 inches
                                                                           
circumference of circle - 2πr
r - radius -
r = diameter / 2 = 35 /2 = 17.5 inches
                                                                           
circumference = 2 x 3.14 x 17.5 = 109.9 inches
                                                                           
circumference is perimeter of whole circle. we need to find the circumference for half the circle.
therefore perimeter for the curved line = 109.9 / 2 = 54.95 inches
                                                                                 
perimeter of half circle = diameter + curved line perimeter = 35 + 54.95 = 89.95 inches
                                                                           
answer is B. 89.95 in.
omg2005wow

Answer: it is B 89.95 in

i hope this helps you

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