Question

A cone has a circular base of radius 10 cm and slant height of 30 cm. Calculate the
surface area.

Answer 1

formulae is πr(r+l)
3.14 × 10 × (10+30)
314/100 × 10 × 40= 1256 sq.cm

Answer 2

Given,
radius, r = 10 cm
slant height, l = 30 cm
Now,
surface area of cone= πr (r+l)
= 3.14 x 10 ( 10 + 30 )
= 31.4 x 40
= 1256
So the surface area of the cone is 1256 cm sq.