parallelogram
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A trapezoid!
Apart from both being a geometric 2D shape, there is little similarity between the two. A rectangle has four parallel sides and a right-angle in each of the four corners. A right-angle triangle has three sides and only a right-angle in one corner.
No they are perpendicular if the intersect at a right angle. + is perpendicular, = is parallel
Such a quadrangle cannot exist. The right angle must be formed by one of the parallel sides and one of the non-parallel sides. Then the angle formed at the other end of that non-parallel side would also be a right angle (the non-parallel side would be a transversal intercepting the two parallels). But then the quadrangle has two right angles, and not just one. No its Trapezoid
It has two right angles. It has a pai of parallel sides.