2 triangles together and a parallelogram is a quadrilateral that has 2 sets of equal sides. ☺
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It is a right angled parallelogram.
A quadrilateral is a parallelogram if it has two pairs of (opposite) sides that are parallel.
It does not. The perimeter of a parallelogram is a characteristic of the parallelogram. The orientation: which side is considered a base makes do difference whatsoever.
No. In fact a parallelogram does not add up. It has a perimeter, it has an area, it has four angles and they are or can be added up. The the parallelogram itself cannot.
4 right angles