Question

A cylindrical pillar is 50cm in diameter and 3.5cm in height.find the cost of painting the curved surface of the pillar at the rate of rupees 12.50 per metre sq​

Answer 1

Answer:

Curved surface area of cylinder= 2πrh

diameter=50cm

r=d/2

r=50/2

r=25cm

h=3.5cm

curved surface area of cylinder=2πrh

=2×22/7×25cm×3.5cm

=2×22/7×25×35/10 cm^2

=2×22×25×5/10 cm^2

=10×22×25/10 cm^2

=22×25 cm^2

=550cm^2

cost of painting per metre square= 12.50

= 550×12.50

=6875