Answer:
Perimeter
= 30.852cm
Explanation:
The top part, the curve, is half of a circle. The circumference of a circle is:
C = pi•d
They asked you to use 3.142 for pi and the diameter is given in the image, 12cm
C = pi•d
= 3.142 • 12
= 37.704
But we only need half of the circumference.
37.704/2
= 18.852
Then, finish up by adding the length of the straight part on the bottom.
Perimeter
= curve + straightpart
= 18.852 + 12
= 30.852
The perimeter of the shape is 30.852cm.