Question

Question 1
Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area. $[Assume\pi =\frac{22}{7}]$

Answer 1

Radius (r) of the base of the cone $=\left(\frac{10.5}{2}\right)cm=5.25cm$
Slant height (l) of the cone = 10 cm
CSA of cone =$\pi rl$
$=(\frac{22}{7}\times 5.25\times 10)c{m}^2=(22\times 0.75\times 10)c{m}^2=165c{m}^2$