Question

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Answer 1

volume = πr^2h=π×49×20=3077.2cm^2
total surface area = 2πr(r+h)=2π×7(7+20)=1186.92 cm^2

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Answer 2

the height of the circular cylinder is 20 cm and the diameter of its base is 14 cm so the radius will be 14/2 =7 cm
so its volume will be ---
$\frac{22 \times 7 \times 7 \times 20}{7} {cm}^{3} \\ = 22 \times 20 \times 7 \: {cm}^{3} \\ = 3080 \: {cm}^{3}$
the total surface are will be ----
$\frac{22}{7} \times 7(2 \times 20 \: + 7) {cm}^{2} \\ = 22 \times 47 \: {cm}^{2} \\ = 1034 {cm}^{2}$
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