If the radius of a hemisphere is $2 x$ , then its total surface area is given by:

3 π

x^{2}

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6 π

x^{2}

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9 π

x^{2}

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12 π

x^{2}

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Solution

The correct option is D
$12 π$ $x^{2}$
Total surface area of a hemisphere with radius $r$ $= 3 π r^{2}$
Given: radius $= 2 x$
Hence, TSA $= 3 π (2 x)^{2} = 12 π x^{2}$

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If a hemisphere has radius __ cm, then total surface area of the hemisphere is 9.42 ${c m}^{2}$ .

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