Question

How many metres of earth must be dug to dig a well 32 m deep with diameter 7 m? Find the cost of
plastering its inner surface at 4.5 per m2​

Answer 1

Step-by-step explanation:

question is »»»»»

How many metres of earth must be dug to dig a well 32 m deep with diameter 7 m? Find the cost of

plastering its inner surface at 4.5 per m2

Given»»»»»»

Radius = diameter /2=7/2 m

height =32m

Solution »»»»»»

and so volume of cylinder = πr^2h

= 22/7×7/2×7/7×32

=1232 m^3

there would be dig 1232m^3 earth for dugging

Cost of plastering inner side as the rate of ₹4.5/m^2

Curved surface area if cylinder = 2πrh

=2×22/7/7/2×32

=704 m^2

=704×4.5

=₹3168

hope this will help you............... OK