Question

A cylinder of radius 3cm and height 4cm is given. If a cone is taken out of it, what is the area of the remaining portion?

Answer 1

TSA of Cylinder=2*pi*r*(h+r)= 131.88

TSA of Cone= pi*r*(l+r)= 75.36

The total area of the remaining solid is,

TSA of cylinder+TSA of cone-the bottom area(This we added twice, one in cone and also one in cylinder)

=131.88+75.36-28.26

= 178.98 sqcm.

hope this helps you