Question

in a building there are 24 cylindrical pillars the radius of each pillar is 28 cm and height is 4 meter the total cost of painting the curved surface area of all players @ rupees 8 per metre square​

Answer 1

||✪✪ QUESTION ✪✪||

in a building there are 24 cylindrical pillars the radius of each pillar is 28 cm and height is 4 meter the total cost of painting the curved surface area of all players @ rupees 8 per metre square ?

|| ★★ FORMULA USED ★★ ||

• CSA of cylinder = 2 * π * r * h
• 1m = 100cm.
• 10000cm² = 1m²

|| ✰✰ ANSWER ✰✰ ||

Given That, Radius of pillar is 28cm ans Height is 4m.

So,

→ CSA of 1 pillar = 2 * (22/7) * 28 * 400 ( As 4 m = 400cm).

→ CSA of 1 pillar = 2 * 22 * 4 * 400

→ CSA of 1 pillar = 70400cm² .

So,

→ CSA of 24 pillars = 70400*24 = 1689600 cm².

___________________

Now,

→ 10000cm² = 1m²

→ 1689600cm² = (1/10000) * 1689600 = 168.96m².

_______________

Now, Given that, Rate of painting is Rs.8/m².

So,

→ Total cost of Painting all pillars = 168.96 * 8 = Rs.1351.68 .

Hence, Total cost of Painting all 24 pillars is Rs.1351.68 .