Question

Find the total cost of painting the cylindrical pillar whose diameter is 28 m and height is 5m. The cost for painting per unit is Rs.10 per m².​

Answer 1

Answer:

• ₹ 4400

Step-by-step explanation:

Given

• Diameter = 28 m
• Height = 5 m
• Cost = ₹ 10/m²

To find

• Cost of painting the cylindrical pillar.

Solution

↪ C.S.A of cylinder = 2πrh

↪ Here,

• Diameter = 2Radius
• Radius = 28/2
• Radius = 14 m
• Height = 5 m

↪ Substituting we get,

• 2 × 22/7 × 14 × 5
• 44/7 × 14 × 5
• 440

∴ C.S.A is 440 m²

Now,

• 1 m² = ₹ 10
• 440 m² = ₹ ?
• 440 m² = 440 × 10
• 440 m² = ₹ 4400

∴ Cost of painting is ₹ 4400.

Answer 2

Answer:

Given length or height of pillar =3.5m

Radius of each pillar =36cm

CSA of pillar =2πrh=2π×0.36×3.5

CSA=7.91m

2

Now total area to be painted =7.91×20

Total Area =158.20m

2

Cost of painting =158.20×3=474.60.

Explanation:

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