Question

if the surface area of an open cone is 180 cm and radius is about 4 cm find its slant height​

Answer 1

Answer:

$surface \: area \: of \: cone \: = \pi \: rl$

$180 = \frac{22}{7} \times 4 \times l$

$l = \frac{180 \times 7}{22 \times 4}$

$l = 14.31 \: cm$