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  1. The volume of a solid hemisphere is 19404 cm³. Its total surface area is
    1. 4158 cm²
    2. 2858 cm²
    3. 1738 cm²
    4. 2038 cm²
Correct Option: A

2
πr³ = 19404
3

⇒
2
 ×
22
 × r³ = 19404
37

⇒ r³ =
19404 × 3 × 7
 = 9261
2 × 22

⇒ r = ³√21 × 2 × 21 = 21 cm.
∴ Total surface area = 3πr²
= 3 ×
22
 × 21 × 21 = 4150 sq.cm.
7


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