Question

A rectangular piece of paper 11 cm x 4 cm is folded without overlapping to make a cylinder of height 4 cm. Find the volume of the cylinder

Answer 1

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$length \: of \: paper = circumference \: of \: cylinder \: formed$
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$11 = 2\pi \: r$
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$11 = 2 \times \frac{22}{7} \times r$
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$\frac{11 \times 7}{2 \times 22} = r$
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$r = \frac{7}{4}$
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$volume \: of \: cyliner = \pi \: r {}^{2} h \\ \\ = \frac{22}{7} \times \frac{7}{4} \times \frac{7}{4} \times 4$
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$volume = 38.5 \: cm {}^{3}$

$<b><font face =copper black size=4 color=purple>$

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