A hemispherical bowl is made of steel 0.25 cm thick. The inner radius of the bowl is 3.25cm thin the outer curved surface area of the bowl is
(a)154
(b)77
(c)38.5
(d)none of these
give reason for your answer
Answers
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Outer radius = thickness + inner radius
=》3.25cm + 0.25
=》3.50 cm
Outer surface area = 2 × pi ×r^2
=》 2×22/7 × 25
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