Find the curved surface area and total surface area of a hemisphere of radius 21 cm.
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Answer:
Given r = 21 cm
Curved Surface Area of hemisphere = 2πr^2
22 = 2×22/7×21 x 21 cm^2
= 2 x 22 x 3 x 21 cm^2
= 2772 cm
Total Surface Area of hemisphere = 3πr^2
22 = 3 x22/7×21 x 21 cm^2
= 3 x 22 x 3 x 21 cm^2
= 4158 cm
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The curved surface area of a hemisphere of radius 21 cm is 2772 cm²
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