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