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The curved surface area (CSA) of a hemisphere of radius r is:

Class 9Surface Area of a SphereMensuration

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

Step-by-Step Solution

A hemisphere is half a sphere, so its curved surface area is

\frac{1}{2}

(4*π*

r^{2}

) = 2*π*

r^{2}

.

Answer: A)

2 * p i * r^{2}

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