Question

Diameter of the base of a cone is 10.5cm and slant height is 10cm. find CSA of a cone
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Answer 1

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∵ Diameter of the base =10.5cm

∴ Radius of the base,

$(r) = \frac{10.5}{2} \: cm$

$⟹(r) = 5.25 \: cm$

Slant height (l)=10cm

∴ Curved surface area of the cone,

$\pi rl = \frac{22}{7} \times 5.25 \times 10$

$= 165 \: {cm}^{2}$

Answer 2

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$\therefore$ Diameter of the base = 10.5cm

$\therefore$ Radius of the base(r) = $\large\dfrac{10.5}{2}$ cm

= 5.25cm

Slant height (l)=10cm

$\therefore$ Curved surface area of the cone = πrl

= $\large\dfrac{22}{7}$ × 5.25×10

= ${\large{\boxed{\sf{165cm²}}}}$

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