A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:
A) 49
B) 50
C) 53.5
D) 55
Answers
Answer:
A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is: 49
OPTION : A) 49
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Answer:
Consider it as a cuboid of length =6m, width =4m & height =1.25m
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).
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× 1.25 = 25m2
Surface area of bottom =6×4=
total area of water surface =25+24=