Question

Find the volume,curved surface area of a cone having base radious 35cm and height 84cm

Answer 1

curved surface of cone is 22/7 ×radius × hight
22/7×35×84
=9240cubic unit
volume of cone is 1/3×22/7× height ×radius ^2
107800 cubic unit
....
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Answer 2

r = 35 cm
h = 84 cm

volume of cone = ⅓ π r² h
=
$\frac{1}{3} \times \frac{22}{7} \times 1225 \times 84 \\ 22 \times 1225 \times 4 \\ 107800 \: cm {}^{3}$
CSA of cone = π r l
l =
$\sqrt{r {}^{2} + h {}^{2} } \\ \sqrt{1225 + 7056} \\ \sqrt{8281} \\ 91 \: cm$
$\frac{22}{7} \times 35 \times 91 \\ 110 \times 91 \\ 10010 \: cm {}^{2}$
volume is 107800 cm³
CSA is 10010 cm²