Question

a cistern 6 metre long 4 metre wide contains water to a depth of 1 metre 25 cm find the area of a wet surface​

Answer 1

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Asked on December 20, 2019 by

Krati Siddiqua

A cistern 6m long and 4m wide contains water up to a depth of 1m 25cm. The total area of the wet surface is:

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ANSWER

Consider it as a cuboid of length =6m, width =4m & height =1.25m

What we have to calculate is ( total surface area of cuboid -surface area of top).

Since water will be wetting the surface in contact & these surfaces area the four walls & the bottom

surface area of walls =a+b+c+d

6×1.25+6×1.25+4×1.25+4×125

=25m

2

Surface area of bottom =6×4=24m

2

total area of water surface =25+24=43m

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Answer 2

Answer:

2(l+b)h+lb=2((6+4)1.25+6×4=25+24=49