Question

Diameter of the base of a cone is 10.5 cm and its slant height is 10cm.find its csa

Answer 1

ans is 165 . because we have diameter of cone is 10.5 so , radius is 10.5\2. next we have slant height 10cm . csa of cone =πrl. 22\7×10.5\2×10=165

Answer 2

Answer:

Radius = $\dfrac{10.5}{2}$ = 5.25 cm

Slant height (l) = 10 cm

$\sf{CSA\:\:of\:\:cone\:\:=\pi\:rl}$

$\\ \implies \sf \: \frac{22}{7} \times 5.25 \times 10 \\ \\ \\ \implies \sf \: (22 \times 0.75 \times 10) \: \: {cm}^{2} \\ \\ \\ \implies \sf \: 165 {cm}^{2}$