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A quadrilateral is "guaranteed" to be a parallelogram if

(a) the opposite side are parallel, or

(b) any line segment perpendicular to one side and intersecting the opposite side is also perpendicular to the opposite side, or

(c) any line segment perpendicular to one side and intersecting the opposite side has the same length as any other such perpendicular line intersecting the opposite side (sometimes vaguely expressed as "opposite sides are everywhere equidistant"), or

(d) the angles at the two ends of any side add up to 180 degrees.

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Q: Different condition that quarantees a quadrilateral a parallelogram?
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