Question

Two cones with same base radius 8 cm and height 15 cm are joined together along their bases. Find the surface area of the volume so formed.

Answer 1

Given that,
r= 8cm
h=15cm
Now,
slant height of cone
l^2= r^2 + h^2
= 64+ 225
= 289
=13 cm
Now,
C.S.A. of one cone is
=πrl
=22/7 * 8 * 13
= 326.85 cm^2

There are two such cones.
so,
=2 * 326.85
= 653.71