Question

Paul needs to wrap yellow tape around the perimeter of a new patio in the shape of a semicircle. The diameter of the patio is 42 meters.

Answer 1

Since it is asking for the circumference of the circle, we can use C=2πr
Since radius is two times the number of a radius, we can use 21 for the radius.
C=2π(21)
C=131.95
But since it is a semi circle, we need to divide this value in half, which would make the final answer 65.98

Answer 2

@Ultrilliam Is this an acceptable answer

Answer 3

the perimeter of a semicircle is not just half a circle, you need to account for the flat side too