Perpendicular rays are two or more rays( part of a line that in one direction continues on) that meet at a right angle and will never meet again.
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a line or segment that is perpendicular to the given segment and divides it into two congruent segments
A line at right angles to another line.
The definition of perpendicular lines also defines the angles -- perpendicular lines are two lines (or line segments) that meet at a 90 degree angle.
Because both lines and rays are infinite in length and thus have no midpoint.
No, a parallelogram does not have perpendicular sides by definition. A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length. Perpendicular sides would form a right angle, which is a characteristic of rectangles, squares, and other types of quadrilaterals, but not parallelograms.