Only by the definition of a perimeter.
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B+h*2 =9*-=423
If the heights and bases are the same, then the triangle is half the area of the parallelogram.
They are both convex polygons.
It is not in all but a trivial sense - that they are both to do with finding the perimeter!
The parallelogram has twice the area of the triangle if their bases are the same and their heights are the same. Area triangle = 1/2 base x height. Area parallelogram = base x height.