Asked by chaithu

A diamensions of a cuboid are in the ratio 4:3:1 and its total surface area is 950cm2 find the diamensions
Answered by Steve
a = 2(4x*3x+4x*1x+3x*1x) = 38x = 950
x = 25

dimensions are 100 x 75 x 25
Answered by Reiny
drat those disappearing exponents.

for that ratio
the sides would be 4x, 3x, and x
SA = 2(12x^2 + 3x^2 + 4x^2) = 950
38x^2 = 950
x^2 = 25
x = 5

sides are 20, 15 , and 5

check:
SA = 2(20x15) + 2(20x5) + 2(15x5) = 950
Answered by Steve
good catch. Usually I check my answers.
gotta love that hubris.
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