Question
Find the volume curved surface area and the total surface area of a hemisphere of radius 10.5 cm.
Answer: Option A
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Volume = `2/3 pir^3 = (2/3 xx 22/7 xx 21/2 xx 21/2 xx 21/2) cm^2` = 2425.5 `cm^3`
Curved surface area = `2pir^2 = ( 2 xx 22/7 xx 21/2 xx 21/2) cm^2 = 693 cm^2`
Total surface area = `3pi r^2 = (3 xx 22/7 xx 21/2 xx 21/2) cm^2 = 1039 .5 cm^2`
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