Question

The perimeter of a semicircular plate is 108
cm, find its area.​

Answer 1

Step-by-step explanation:

Perimeter of a semicircular plate = pi * R + 2R

108 = R ( pi + 2 )

108 = R ( 3.14 + 2)

108 = R * 5.14

R = 108/5.14

R = 21

Now,

area of a semicircular plate = pi * R * R / 2

area = 22/7 * 21 * 21 * 1/2

area = 11 * 3 * 21

area = 693

area = 693 sq.cm