Question

the curvved surface area of a cylinder is 440 m2. find its vilume if its height is 21 cm

Answer 1

c.s.a=440
$2\pi \: rh = 440$
2×22/7×r×21=440
r=11/3
volume=
$\pi \: r^{2} h$
22/7×11/3×11/3×21
2662/3
887.3

Answer 2

$csa \: = 2\pi rh \\ 440 = 2 \times 22 \div 7 \times r \times 21 \\ 10 = r \times 3 \\ r = 10 \div 3$
$volume = \pi {r}^{2} h \\ 22 \div 7 \times {(10 \div 3})^{2} \times 21 \\ 22 \times 10 \times 10 \div 3 \\ = 2200 \div 3 \\ = 733.333 {m}^{3}$
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