7.Findtheareaofsemicircleasdiameteris14cm.
(a)770cm². (b)77cm². (c)120cm². (d)noneofthese
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Diameter = 14 cm
Area of a semi-circle = 1/2 × πr²
where, π is 22/7 and r^2 is square of the radius.
Radius, r = Diameter/2 = 14/2 cm = 7 cm
Area of the semi-circle = 1/2 × 22/7 × 7 × 7
Area of the semi-circle = 11 × 7
Area of the semi-circle = 77cm²
Answer:
Area of the semi-circle is 77cm². Hence (b) 77cm² is the correct option.
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