The area of top and bottom faces of a frustum are 16 $c m^{2}$ and 36 $c m^{2}$ . If the frustum is 30 cm high its volume is

760

c m^{3}

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380

c m^{3}

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592.11

c m^{3}

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None of the above

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Solution

The correct option is A 760 $c m^{3}$
$V = \frac{1}{3} \times 30 (16 + 36 + \sqrt{16 \times 36}) c m^{3} = 760 c m^{3}$

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Question 11

The volume of a cube is $64 c m^{3} .$ Its surface area is
(a) $16 c m^{2}$ (b) $64 c m^{2}$
(c) $96 c m^{2}$ (d) $128 c m^{2}$

c m^{3} .

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