Question

Rasheed got a playing top (lattu) as his birthday present, which surprisingly had no colour on it. He wanted to colour it with his crayons. The top is shaped like a cone surmounted by a hemisphere. The entire top is 5 cm in height and the diameter of the top is 3.5 cm. Find the area he has to colour.

Answer 1

CSA of hemisphere=`2 pi r^2`
=`2*22/7*(3.5/2)^2`
=19.2775` cm^2`
Surface Area of cone= `pi r l`
=`22/7*(3.5/2)*sqrt((3.5/2)^2+(6.5/2)^2)`
=20.35`cm^2`
Total area=CSA of hemisphere+ SA of Cone
=19.2775+20.35
=39.6275 `cm^2`.