Lines that intersect at 90 degrees are perpendicular lines
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a pair of intersecting lines that are perpendicular
A perpendicular diagonal is a pair of segments or lines that cross a polygon making a perpendicular
One pair of perpendicular lines would create one right angle. Some kites have one right angle.
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.
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.