Question

A model of cicus tent in the shape of a frustum of a cone having diameter of the lower end 5 centimetre and diameter of upper end 2 centimetre and is surmounted by a hemisphere the and the entire height of the model is 7 centimetre find its surface area?

Answer 1

let l be the length of the frustum. so the radius of the hemisphere is 1 cm .and the radius of the lower end is 2.5 cm.but s.a of the structure=2πr²+π(3.5)×6.18
or, the total surface area of the structure=74.20cm².