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A solid hemisphere has radius 21 cm. Find its total surface area in $cm^{2}$ . Take π = 22/7.

Competition practiceAreas & Volumes

A4158
B2772
C1386
D5544

Step-by-Step Solution

Total surface area = curved surface + flat circular face = 2π

r^{2}

+ π

r^{2} = 3

π

r^{2} = 3 \times (22/7) \times 441 = 3 \times 1386 = 4158 cm^{2}

.

Answer: A) 4158

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