Question

the internal and external diameters of hollow hemispherical vessal are 24cm and 25cm respectively the cost to paint 1cmsqare the surface is Rs.0.05 find the total cost to paint the vessal all over

Answer 1

first find out the C.S.A. of hemisphere internal and external both using 2πrsq.
Now add the both C.S.A. and multiply by 0.05 to get the cost.
Done