Question

how many cubic mof earth must be dug to construct a well 7m deep and diameter 2.8m

Answer 1

⭐⭐heya mate⭐⭐

here is ur answer....

Find the radius:

Radius = Diameter ÷ 2

Radius = 2.8 ÷ 2 = 1.4 m


Find the volume:

Volume = πr²h

Volume = π (1.4)²(28)

Volume = 172.48 m²


Find the inner surface area:

Surface area = πr² + 2πrh

Surface area = π(1.4)² + 2π(1.4)(2.8)

Surface area = 6.16 + 24.64

Surface area = 30.8 m²


Find the cost of plastering:

1 m² = ₹4.50

30.8 m² = 4.5 x 30.8 = ₹ 138.60


Answer: 172.48 m² of earth needs to be dug out and the cost of plastering is ₹ 138.60

please mark as a brainliest ❤☺☺✌✌

Answer 2

Answer:

Only answer

172.48 m² of earth needs to be dug out and the cost of plastering is ₹ 138.60