Question

The diameter of a road roller is 2.8m, and its length is 2.1 m.,
how much area of a fiend will be pressed in its 300 ratations?
What is the cost of pressing the land at Rs.7 per sq.m.? ( 1 = 42)​

Answer 1

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1980

Answer 2

Step-by-step explanation:

radius = 1.4 m

height = 2.1 m

area pressed in one rotation =

C.S.A of hemisphere = 2πrh

in 300 revolutions,

300 × 2 × 22/7 × 1.4 × 2.1

5544 m²

Cost : 7 × 5544

rs. 38,808