Find (i) the curved surface area and (ii) the total surface area of a hemisphere of
radius 21 cm.
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3
Answer:
Curved Surface area of a hemisphere =2πr
2
=2×
7
22
×21×21=2772cm
2
Total surface area of a hemisphere =3πr
2
=3×
7
22
×21×21=4158cm
2
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