Answer:
24+6pi
Explanation:
the sides on the left and right added up are
12+12=24.
the formula for perimeter of a circle is 2πr.
3 is the radius, making the equation
2π3 which is 6 pi.
for the top semicircle, the perimeter would be 6 pi divided by 2 because its a semicircle.
the bottom cut out half would also be 3 pi.
in total, we would have 24+3pi+3pi which would lead you to 24+6pi.