Question

A well is to be dug 20 m deep, 2.25 m
inside diameter, with a brick lining of 0.35
m thickness. What is the amount of brick
work done?
(A) 14.75 m3 (B) 57.2 m3
(C) 136.75 m3 (D) 572 m3​

Answer 1

Answer:

h=20m, Inner radius, r=

2

2.25

=1.125m

Brick work thickness =0.35m

Outer radius, R=r+0.35m=1.475m

∴ Volume of brick work =π(R+r)×0.35×20

=

7

22

(1.475+1.125)×7

=22×2.6=57.2m

3

Step-by-step explanation:

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