Question

4.A cylindrical pillar is 50cm in diameter
and 3.5m in height. Find the cost of
painting it's curved surface at the rate of
12.50 per sq.m​

Answer 1

H=3.5m, R= 50/2=25cm=25/100= 0.25m

CSA=2πrh=(2×22/7×0.25×3.5)sq.m

=5.5 sq.m

Cost of painting 1 sq.m area= Rs.12.50

Cost of painting 5.5 sq.m area

=Rs.5.5×12.50

= Rs.68.75