Question

Diameter of the base of a cone id 10.5cm and its slant height is 10 cm. Find its curved surface area.
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Answer 1

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GIVEN: - base=10.5cm, height =10cm

REQUIRED TO FIND :- Curved surface area of cone

FORMULA: - ${\boxed{CSA = pi×r×l}}$

SOLUTION :-

Base =10.5 , so Radius =10.5/2 =5.25

$csa = \pi \times 5.25 \times 10$

= 164.9

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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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