Question

A cylindrical roller 2.5 m in length ,1.5m in radius when rolled on a road was found to cover the area of 16500 sq.m .

Answer 1

Area of cylindrical roller =2pi×rh =curved Area of cylinder
number of rounded roller =Area of road cover/curved area of cylindrical roller


=(16500)/(
2×22/7×1.5×2.5)

=(16500×7×10×10)2×22×15×25
=16500×7)/11×15
=(1500×7)/15
=(100×7)rounds
=700rounds