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