A right-angle triangle.
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a pair of intersecting lines that are perpendicular
A pair of infinitely long parallel lines.
A trapezoid
a triangle, pentagon and that's all i can think of * * * * * A right angled triangle has a pair of perpendicular lines! Likewise, a pentagon can have a pair. A circle, ellipse etc do not.
Lines that intersect at 90 degrees are perpendicular lines