a 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m , find the height of the platform.
please answer very clearly.
class 10 Math
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volume od well = volume of earth dug = π× r^2×h .
= 3.14×3.5×3.5×20 = 769.3 cubic metre
height of platform = 769.3/ area of field
=769.3/(22×14) = 2.49 m
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