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The total surface area (TSA) of a solid hemisphere of radius r is: (CSA = curved surface area, TSA = total surface area)

Class 9Surface Area of a SphereMensuration

A $3 * p i * r^{2}$
B $2 * p i * r^{2}$
C $4 * p i * r^{2}$
D $5 * p i * r^{2}$

Step-by-Step Solution

TSA of a solid hemisphere = curved part + flat circle = 2*π*

r^{2}

+ π*

r^{2} = 3 *

π*

r^{2}

.

Answer: A)

3 * p i * r^{2}

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