Question

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.​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answers

The cost of cleaning the pillars at the rate of 50 per is

$= \: rupess.118800$

Explanation

Diameter of pillars = 84 cm

Radius of pillars =

$\frac{84}{2} = 42cm$

100 cm =1m

Radius of pillar =0.42

Height of pillar =6m

Curved surface area of 150 pillar = 2 π rh =2×

$\frac{22}{7} \times 0.42 \times 6 = 15.84m ^{2}$

Curved surface area of 150 pillar =150 ×15.84 =2376m

Cost of cleaning 1 sq. m =₹ . 50

Cost of cleaning =2376sq.m=2376×50 =₹ . 118800

Hence the cleaning of pillars at rate of 50per m2 is ₹.118800