Question

a well of radius 175 cm is dug to a depth of 20 m how many cubic meters of earth are dug out find the cost of plastering the internal curved surface at ₹ 20 per sq. m
Please answer with proper steps

Answer 1

Answer:

Step-by-step explanation:

r = 175cm = 1.75 m

h = 20m

v = ?

v = pie r * r * h

     22/7 * 1.75 * 1.75 * 20

     192.5 cm cube

CSA = 2 pie * r * h

           2 * 22/7 * 1.75 * 20

           220 m square

Answer 2

Answer:

192.5, 3850

Step-by-step explanation:

Given, radius = 175 cm = 1.75 m.

Given, height = 20 m.

Volume of earth dug out = πr²h

                                         = (22/7) * (1.75)² * 20

                                         = 1347.5/7

                                   = 192.5 m².

Now,

Cost per m² = 20.

Total cost = 20 * 192.5

              = 3850.

Hope it helps!