Question

Find the curved surface of a right circular cone , whose slant height is 25cm and the radius of the base is 7cm.

Answer 1

Given :

Slant height of right circular cone = 25cm

Radius of the base = 7cm

To Find :

Curved surface of a right circular cone

Solution :

As we know

Curved surface area of cone = πrl

putting values we get :

Curved surface area of cone =

=> π×7×25

=> 22/7×7×25

=> 550 cm²

Hence, Curved surface area of cone is 550 cm²

Answer 2

${\mathbf {\blue{S}{\underline{\underline{olution:-}}}}}$

$\mathfrak{\underline{AnswEr:-}}$

• The curved surface of a right circular cone = 550 cm²

$\mathfrak{\underline{Given:-}}$

• The slant height of a right circular cone is 25cm and the radius of the base is 7cm.

$\mathfrak{\underline{Need\:To\: Find:-}}$

• The curved surface of a right circular cone = ?

${\mathbf {\blue{E}{\underline{\underline{xplanation:-}}}}}$

$\:\:\:\:\dag\bf{\underline \green{Formula\:used\:here:-}}$

$\bigstar{\underline{\boxed{\sf\purple{Curved \:surface\: area\: of \:cone = \pi rl}}}}$

$\:\:\:\:\dag\bf{\underline \blue{Putting\:the\:values:-}}$

$\longrightarrow \sf {C.S.A\:of\: cone = \pi \times 7 \times 25}$

$\longrightarrow \sf {C.S.A \:of\:cone = \dfrac{22}{7} \times 7 \times 25}$

$\longrightarrow \sf {C.S.A \:of\:cone = 550\:cm^2}$

$\:\:\:\:\dag\bf{\underline{\underline \green{Hence:-}}}$

• The curved surface of a right circular cone = 550 cm²

$\rule{200}{2}$