Can someone please help with a question? Pleasee!!!

Question

anonymous · Answer

A sign designer created a sign in the shape shown below. The semicircles are congruent to one another with a diameter of 4 inches. What is the perimeter of the sign? 
Answer 
about 38 inches 
about 78 inches 
about 76 inches 
about 80 inches

amistre64 · Answer

there are 3 circles; so we need the circumference of 3 circles each with a diam of 4

then add in the 2 sides

amistre64 · Answer

the rectangle to fit it would be 4*6+40 = 64 so it has to be bigger than 64

anonymous · Answer

so 76 inches?

amistre64 · Answer

maybe ... lets see :)

3(C)+40  ; C = dpi

3(4pi) + 40 = 12pi+40

pi is about 3 so 36+40 = 76 but that 78 is to close for comfort; how accurate you need to be on pi?

amistre64 · Answer

im thinking it is at least 76 since pi is a little bigger than 3

amistre64 · Answer

google says:

(12 * pi) + 40 = 77.6991118

anonymous · Answer

thanks

amistre64 · Answer

yw