Question

3. Abhinav made a model for his school project in the shape of a cylinder of radius 7
cm and height 21 cm,with hemisphere surmounted on one end. He wants to cover the
entire model with decorative paper. What is the area, in centimeter square,of paper that is required to cover the model? (Use n as "22/7")
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Answer 1

$Area \: of \: paper\: required \: to \: cover \: the \: model = 2 \pi \: r \: h + 2\pi {r}^{2} \\ = 2\pi \: r(h + r) = 2 \times \frac{22}{7} \times 7(21 + 7) \: {cm}^{2} \\ =( 44 \times 28) {cm}^{2} \\ = 1232 {cm}^{2}$