Question

the Radius and vertical height of cone are 5 cm and 12 cm find curved surface area​

Answer 1

Answer:

curved surface area of a cone is 204.29.

Step-by-step explanation:

For a conical shape,

Radius (r) = 5cm

height (h) = 12 cm

slant height (l) = ?

Radius is perpendicular to height.

${l}^{2} = {r}^{2} + {h}^{2} \\ {l}^{2} = {5}^{2} + {12}^{2} \\ {l}^{2} = 25 + 144 \\ {l}^{2} = 169 \\ taking \: square \: root \: both \: side \\ l = 13$

$curved \: surface \: area \: of \: a \: cone \\ = \pi \times r \times l \\ = \frac{22}{7} \times 5 \times 13 \\ = \frac{1430}{7} \\ = 204.29$