The perimeter of a semicircle is 72cm. what is the diameter

The diameter of the semicircle is 7 inch.

Step-by-step explanation:

So, diameter of the semicircle is 7 inch, whose radius is 7 inch. Therefore area of semicircle is 113.04 inch 2, whose diameter is 24 inch. So, circumference of semicircle is 21.98, whose radius is equal to 7 inch. So, arc length of a semi circle is 3.64 inch, whose radius is 7 inches and central angle is 60 degree.