Question

A well 3.5 m in radius and 22.5 M deep has to be dug. find the cost of digging the well at rupees 3.40 cubic metre

Answer 1

Answer:

he cost of digging the well at rupees 3.40 m³  RS. 2942.5725

Step-by-step explanation:

Volume of cylinder = πr²h

r - radius and h - height

It is given that,

A well 3.5 m in radius and 22.5 M deep has to be dug.

The cost of digging the well at rupees 3.40m³  

The well is like a cylinder, we have to find the volume of well

To find the volume of well

r = 3.5m and h = 22.5m

Volume of cylinder = πr²h = 3.14 * 3.5² * 22.5 = 865.4625 m³

To find the cost

cost = volume *cost per cm³  =  865.4625 * 3.40 = RS.2942.5725

Answer 2

Answer:

radius =3.5

height =22.5

cost of digging the well at rupees =3.40m^3

volume of well =r =3.5 m and height =22.5 m

volume of cylinder (because the shape of a well is like a cylinder ) = ( pi r ^2h = 22/7 × 3.5 × 3.5 × 22.5 = 866.25 m^3

therefore,

cost =volume ×cost per cm^3

=866.25 ×3.40 = rupees 2945.25