Math, asked by rvss91024, 2 months ago

how many cubic metres of earth must be dug out to sink a well having diameter 4 metre and depth 35m?​

Answers

Answered by ItzMeMukku
1

Step-by-step explanation:

The amount of earth to be removed is the volume of the cylinder of the well. It is cross section area time height. V= pi×r^2×h. r is 3 and h is 21

3.1416 × 3^2 × 21 = 593.8 cu meters

The plastering surface is the vertical surface of the cylindrical well. It is the circumference times the height. A= 2 × pi × r × h = 2 x 3.1416 × 3 × 21

A = 395.84 sq meter

At 20 rupees per sq meter the cost is 7917 rupee

Answered by PurvaAnantwar
4

Answer:

Answer is 440m^3 of earth must be dug out to sink a well having diameter 4m and depth 35m.

Step-by-step explanation:

Given:- diameter=4m

radius=d/2

=4/2

. =2m

and height,(here depth)=35 m

well is cylinder in shape generally

For this we need to take out volume of well with following measurements.

Volume of Cylinder= πr^2h

= 22/7 *2*2*35

=22*2*2*5 (7 divides 35 by 5 )

= 22*20

=440m^3

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