Question

Find the cost of painting 15 cylindrical pillars of a building at Rs 2.50 per sqm. If the diameter and height of each figure are 48cm and 7cm respectively.

Answer 1

=2×22/7×7×48/2
=22×48
=1056
=1056×15
=15840
=15840×2.50
=39600.

Answer 2

There are 15 cylindrical pillars.
Cylinder:
r=24cm
h=7cm
CSA of cylinder=2πrh
                         =2·(22/7)·24·7
                         =1056cm^2
Cost of painting 15 pillars=15·2.50·1056
                                        =Rs 39600