Question

Curved surface area of right circular cone whose radius is 3cm,and vertical height is 4cm

Answer 1

Hey,

Given informations are:

radius = 3 cm

height = 4 cm

The formula for finding curved surface area of right circualr cone = pi×r×L

Where L = √h²+r² = √4²+3² = √16+9 = √25 = 5 cm

So curved surface area = 22/7×5×3 = 330/7 cm²

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Answer 2

AnswEr:

We have,

• r = 3 cm
• h = 4 cm

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Let l be the slant height of the cone. Then,

$\qquad \tt \: {l}^{2} = {r}^{2} + {h}^{2} \\ \\ \implies \tt { l }^{2} = {3}^{2} + {4}^{2} \\ \\ \implies \tt \: l = \sqrt{25} \: cm = 5 \: cm$

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$\therefore$ Area of the curved surface = πrl

$\red\rightarrow \tt \: ( \frac{22}{7} \times 3 \times 5) \: {cm}^{2} = 47.14 \: {cm}^{2}$