Question

There are 20 cylindrical pillars in a building each having a dimeter of 50cm and height 4m .find the cost of cleaning them at 14 per m square

Answer 1

height of pillar=4m
diameter of pillar=50cm
radius of pillar=50/2=25cm
radius in m=25/100m
curved surface area of one pillar:
$2\pi \times r \times h$

$2 \times 22 \div 7 \times 0.25 \times 4$
=6.285714286m
cost of cleaning of one pillar=
$rs14 \times 6.285714286$
=rs88

cost of cleaning of 20 pillars =
$20 \times 88$
=rs1760

Answer 2

Answer:Here is your answer

(2×22/7×25/100×4×20)m²

After multiplication,

(880/7)m²

So,

RS.(880/7×14)

= RS.1760

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Step-by-step explanation: