Question

Find the cost of white washing 10 pillars around the building.The radius of a pillar 2mt and 7mt high.The cost of white washing per m^2 is Rs.4.75

Step by step explain plzzzzzzzz​

Answer 1

★ Answer ★

The cost of white washing the 10 pillars = 418 Rs.

Step by step explanation:-

Given :-

• Radius of the Pillar - 2 m
• Height of the Pillar - 7 m
• The cost of white washing per m² is Rs. 4.75

Have to Find :-

Find the cost of white washing 10 pillars around the building.

Solution :-

As we all know that the pillar is in cylindrical shape.

So, Now applying the Curved surface area of cylinder

Curved surface area of cylinder = 2πrh

By Substituting the values in the above formula, we get

$\longmapsto\tt{CSA =2\times\dfrac{22}{{\cancel{7}}}\times{2}\times{{\cancel{7}}}}$

↬ 2 × 22 × 2

↬ 44 × 2

↬ 88 m²

Now, from given cost for 1 pillar ↬ 4.75

Hence,

➤ Cost of white washing 10 pillars ↬ 88 × 4.75 = 418 Rs.

Answer 2

Given :-

The radius of a pillar 2mt and 7mt high.

The cost of white washing per m² is Rs. 4.75

To Find :-

Cost of white washing 10 pillars.

Solution :-

Using ,

Curved surface area of cylinder = 2πrh

Then,

CSA =2 × 22 × 7 × 2 /7

⇒ 2 × 22 × 2 × 7

= 44 × 14/7

$\longmapsto\tt{A=\cancel\dfrac{616}{7}}$

⇒ 88 m²

Cost for 1 pillar = 4.75

Therefore ,

Cost of white washing 10 pillars

= 88 × 4.75

= 418 Rs.

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