Question

the volume of a right circular cylinder is 4224 cm cube. its height is 21 cm find the total surface area of the cylinder

Answer 1

Hi friend
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Your answer
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VOLUME OF THE CYLINDER = 4224cm³

HEIGHT = 21 CM

NOW,
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LET THE RADIUS BE r.
THEN,
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π × r² × h = 4224
$r {}^{2} = \frac{4224 \times 7}{21 \times 22} \\ r {}^{2} = 64 \\ r = \sqrt{64} \\ r = 8 \: cm$
NOW,
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TOTAL SURFACE AREA = 2πrh + 2πr²
= 2πr (h+r)

$= 2 \times \frac{22}{7} \times 8 \times (21 + 8) \\ = \frac{352 \times 29}{7} cm {}^{3} \\ = 1487.285 \: (approximately)$
HOPE IT HELPS

#ARCHITECTSETHROLLINS

Answer 2

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