Question
The circumference of a semi-circle is 108 cm. What is
the area of the circle with the same radius as the semi-circle? (Take Ο = 22/7)Solution
Circumference of a semi-circle = (Ο Γ radius) + (2 Γ radius) = {(22/7) + 2} Γ radius Or, (36/7)Γ radius = 108 Or, radius = 108 Γ (7/36) So, radius = 21 cm So, area of the circle with same radius = Ο Γ radius2 = (22/7) Γ 21 Γ 21 = 1386 cm2
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