Question

find the C.S.A of a right circular cone pf radius 5cm and slant height 28cm

Answer 1

CSA=22/7*5*28=440cm^2

Answer 2

$\blue{\bold{\underline{\underline{Answer:}}}}$

$\green{\therefore{\text{C.S.A\:of\:cone=440\:cm}^{2}}}$

$\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}$

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 5 \: cm} \\ \\ : \implies \text{Slant\:height(l) = 28 \: cm} \\ \\ \red{ \underline \bold{To \: Find : }} \\ : \implies \text{C.S.A\: of \: cone = ?}$

• According to given question :

$\bold{As \: we \: know \: that \: C.S.A \: of \: cone}\\ : \implies \text{C.S.A\: of \: cone} = \pi rl \\ \\ : \implies \text{C.S.A \: of \: cone} = \frac{22}{7} \times 5 \times 28\\ \\ : \implies \text{C.S.A \: of \: cone} =22 \times 20\\ \\ \green{ : \implies \text{C.S.A\: of \: cone} =440\: {cm}}^{2}$

$\purple {\text {some \: formula \: related \: to \: this \: topic}} \\ \pink{\circ \: \text{t.s.a \: of \: cone =} \pi rl + \pi {r}^{2} } \\ \\ \pink{\circ \: \text{volume \: of \: cone =} \frac{1}{3} \pi {r}^{2} h}$