Question

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cost of painting
8. Find the volume, curved surface area and the total surface area of a
cone having base radius 35 cm and height 12 cm.
and the total surface area of
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Answer 1

Step-by-step explanation:

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Answer 2

A cone having base radius 35 cm and height 12 cm.

Volume -

$v = \frac{1}{3} \pi \: {r}^{2} h \: = \frac{1}{3} \times \frac{22}{7} \times {35}^{2} \times 12$

$v = 15400 \: {cm}^{3}$

Slant height -

$l = \sqrt{ {35}^{2} + {12}^{2} } \\ l = \sqrt{1369} = 37 \: cm$

Curved surface area -

$s = \pi \: rl \\ s = \frac{22}{7} \times 35 \times 37 \\ s = 4070 \: {cm}^{2}$

Total surface area -

$a = s + \pi \: {r}^{2} \\ a = 4070 + \frac{22}{7} \times {35}^{2} \\ = 4070 + 3850 \\ = 7920 \: {cm}^{2}$