Question

A 20m deep well with inner diameter 7m is dug and earth is evenly spread out all

around the well to form an embankment of width 5m. Find the ht. of the embankment.
​

Answer 1

Step-by-step explanation:

Diamter = 7 m

so, radius = 3.5 m

Earth dug out from (cylindrical) well

=π×r×r×h

=

7

22

×3.5×3.5×20

=770m

3

to from platform ...... (cuboidal)

volume of cuboid = l×b×h

770=22×14×h

so, height =

22

770

×14=2.5m