The semicircles are congruent to one another with a diameter of 4 inches. What is the perimeter of the sign?

Question

unklerhaukus · Answer

the perimeter is equal to the sums of the lengths of the two straight lines 
plus the circumference of three three circles (from 6 semicircles)

unklerhaukus · Answer

the circumference of a circle is $$2\pi r$$

anonymous · Answer

so how would i plug the numbers in ?

unklerhaukus · Answer

$$2\times20 \text{in}+6\times2\pi\times\left(\frac {4\text {in} }2\right)$$

anonymous · Answer

i got 64 i no its wrong

anonymous · Answer

do i multiply 3.14?

unklerhaukus · Answer

if you need a numerical answer you can use $$\pi\approx 3.142$$

anonymous · Answer

now i got 144 wat am i doing wrong?

unklerhaukus · Answer

$$=40\text {in}+24\pi\text{ in}$$
$$=40+(24\times3.14)\text {in}$$

anonymous · Answer

ooo i gt 38 ?

unklerhaukus · Answer

how could you et less than 40?

unklerhaukus · Answer

*get

anonymous · Answer

from the first problem u pt up i used 3.14*2

unklerhaukus · Answer

huh?

anonymous · Answer

the third post u put up

anonymous · Answer

i followed the equation. i think its rite because these are the options : about 38 inches

 about 78 inches

 about 80 inches

 about 76 inches

unklerhaukus · Answer

$$P=2l+3\times2\pi r=2l+3\times2\pi \frac d2$$

unklerhaukus · Answer

sorry i got confused withe the semicircles before