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A hemisphere of radius r is scooped out of one face of a cube. What is the area of the flat circular opening removed from that face?

Class 10Surface Area of Combined SolidsMensuration

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

Step-by-Step Solution

The opening of a hemispherical cavity of radius

r

is a circle of area π*

r^{2}

, which is removed from the cube face.

Answer: A)

p i * r^{2}

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