Question

the diameter of Garden roller is 5.6 centimetre and it is 1 metre long.how much will it cover in 20 revolutions?​

Answer 1

Answer:

Diameter ( d) = 5.6 cm

then, Radius( r) = 5.6/2 = 2.8 cm

length = 1m=100cm

now , perimeter = 2πr = 2*(22/7)*2.8 = 17.6 cm

therefore , curve surface area ( CSA) = perimeter * length = 17.6 * 100 cm

= 1760cm²

Now, area covered in 20 revolution = 20 * CSA = 1760 * 20 = 35,200cm²