Question

the diameter of a roller is 40 cm and length is 1 m . it tacks 500 rounds out of stduim find the area

Answer 1

h = 1m

r = 40/2 = 20cm

C.S.A of a Cylinder = 2πrh

= 2 × 22/7 × 0.2 × 1

= 1.232m²

Since it takes 500 revolutions or rounds , we multiply the CSA of its roller by 500.

Area of field = 500 × C.S.A of roller

Area of field = 500 × 1.232

= 616 m²