area of four wall of a room is 168msquare breadth and height of room 10m and 4m find lenght of room.
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b = 10m
h = 4m
C.S.A = 168m square
area of 4 walls of a room = curved surface
area of cuboid
C.S.A of cuboid = 2 (l+b)h
2 (l + 10) × 4 = 168
2 (l + 10) =168/4
2 (l+10) = 42
l + 10 = 42/2
l = 21 - 10
l = 11
h = 4m
C.S.A = 168m square
area of 4 walls of a room = curved surface
area of cuboid
C.S.A of cuboid = 2 (l+b)h
2 (l + 10) × 4 = 168
2 (l + 10) =168/4
2 (l+10) = 42
l + 10 = 42/2
l = 21 - 10
l = 11
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