Question

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

Answer 1

Step-by-step explanation:

l=10m,b=4m,h=4m

Area of wall =2(lh+bh)

=2(10×4+4×4)

=112

cost of whitewashing is=15×112=1680

Cost ⇒Rs.1680

Answer 2

★ 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.

_____________________________