Answer:
12.6
Step-by-step explanation:
First we find the perimeter of the rectangle minus 8, because there is one side that is not showing on the outside of the shape
Perimeter of (not really) rectangle: 28
To find the circumference/perimeter of the semi circle, use the formula 2πr/2
to find r, the radius, divide 8 by 2, which is 4
Now we can substitute r for 4 giving us the expression 8π/2
divide 8 by 2: 4
now we have 4π
Round 4π to the nearest tenth, and we get 12.6
