Question

a 20m deep well with diameter 7m is dug and the earth from digging is evenly spread out to form a platform 22m by 14m. find the height of the platform

Answer 1

Step-by-step explanation:

Diamter = 7 m

so, radius = 3.5 m

Earth dug out from (cylindrical) well

=π×r×r×h

= 22/7×3.5×3.5×20

=770m3

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

volume of cuboid = l×b×h

770=22×14×h

so, height = 770/22×14=2.5m

Answer 2

Answer:

2.5 m

Step-by-step explanation:

Diamter = 7 m

so, radius = 3.5 m

Earth dug out from (cylindrical) well =π×r×r×h= 722 ×3.5×3.5×20

=770m

platform.

volume of cuboid = l×b×h

770=22×14×h

so, height = 22

770 ×14= 2.5 m

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