To find the perimeter of a semicircle you will need to find the circumference of a whole circle with a radius of 3 cm. Then you would divide your answer by 2 or multiply it by 1/2.
Explanation: Semi-circle is defined as half a circle. The formula used to compute the perimeter of the semi circle is: perimeter = πr + 2r where: π is a constant = 3.14 r is the radius = 3 cm
Substitute with the givens in the above formula to get the perimeter as follows: perimeter = π(3) + 2(3) perimeter = 3π + 6 perimeter = 3(3.14) + 6 perimeter = 15.42 cm
