Question

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

Given :

★ Diameter = 10.5 cm

★ Slant Height = 10 cm

To Find :

★ Curved Surface Area .

Solution :

Height = 10 cm

Diameter = 10.5 cm

Radius = 10.5/2

Formula Used :

$\sf{C.S.A\:of\:Cone=\pi{r}l}$

Now :

22/7 × 1065/2 × 10/10

11 × 15

165 cm²

Hence , The Curved Surface Area of Cone is 265 cm² .

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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