It is not. A triangle is one of the few plane shapes where decomposition will rarely help.
Also, what is a complex triangle?
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Because normally, there is no way to do it directly.
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It is not in all but a trivial sense - that they are both to do with finding the perimeter!
the area of a triangle is base times height times one half and rectangle is length times width
Finding the sides of any triangle that is not a right angle triangle