Question

a manufacturer involves 12 children in colouring pen stands all over excluding base which are in the shape of a cylinder made of wood of thickness 2cm. the inner radius of the cylinder is 4cm and its height is 14cm.Find the area they had to paint 50 pen stands were given to them for painting. kindly not give links give exact solution

Answer 1

area that the manufacturer hav to paint in 50 stands = 50 x 2πRh x π(R^2- r^2)
= 50 x 2 x 22/7 x 6 x 14 x 22/7 ( 36-16)
= 100 x 44 x 6 x 22/7 x 20
=4400 x 120 x 22/7
=52800 x 22/7
=1161600/7
=165942.85