Question

A wooden toy is in the form of a cone surmounted on a hemisphere. The diameter of the base of the cone is 6cm and its height is 4cm. Find the cost of painting the toy at the rate of ₹5 per 1000cm²

Answer 1

Radius =3cm
Height =4cm
CSA=
$\pi \: rl$
22/7*3*5
=3.14*3*5
=47.1cm2
Cost =5/1000*47.1
=Rs. 0.2355
Radius of hemisphere=3cm
CSA =2*22/7*3*3
=56.52cm2
Cost,=5/1000*56.52
=282.6/1000
=0.2826
Total cost of painting =0.2355+0.2826
=Rs 0.5181