1. 150 cylindrical pillars of the Delhi Metro are to be
cleaned. If each pillar has a diameter of 84 cm and a
height of 6 m, find the cost of cleaning the pillars at a
rate of 50p per m².
Answers
Answer:
The cost of cleaning the pillars is 1188 Rs
Step-by-step explanation:
Given : Diameter of pillar, D= 84 cm = 0.84 m
Height of pillar = 6 m
No of pillars = 150
rate of cleaning = 50 p per m²
Solution : The shape of pillars is cylindrical and cleaning to be done for
lateral surface area.
Lateral surface of pillar = π x D x H
= 22/7 x 0.84 x 6
= 22 x 0.12 x 6
= 15.84 m²
Total lateral surface area = no of pillars x area of one pillar
= 150 x 15.84
= 2376 m²
The cost of cleaning = total lateral surface area x rate
= 2376 x 50
= 118800 p
= 1188 Rs