A parallelogram has 4 sides and 4 angles that add up to 360 degrees whereas a triangle has 3 sides and 3 angles that add up to 180 degrees.
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A triangle is not a quadrilateral, but a parallelogram and trapezoid are.
The difference between a triangle, rectangle, pentagon, and parallelogram id the number of sides: Triangle= 3 sides Rectangle= 4 sides Pentogon= 5 sides But, a parallelogram, is a polygon that has all sides parael to one another.
A parallelogram is slanted. A rectangle is not.
The answer depends on how the parallelogram in the triangle is constructed.
you do it because the triangle is half the size of the parallelogram