
Bob A. answered 04/02/14
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Call the two sides of the window H for height. Call the top and bottom W for width.
Given the top light is an equilateral triangle, all three sides are equal,
and given the base forms the top width of the window; the sides must also = W.
So we have (2 x H) + (4 x W) = 6 meters.
I have 2 unknowns and only 1 equation so if I understand the question correctly,
we are missing a set of constraints that will give us a second equation.
Is there more to it you might have missed in the problem?

Bob A.
04/02/14