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Segments of equal length are called congruent segments. You can identify them by congruency marks. congruency marks look like this on your line: ---l-----------l---
Their slopes are equal.
A point that divides a segment into two segments of equal length is a midpoint.
Many polygons, such as squares, rectangles, rhombi, parallelograms, etc. have more than 1 pairs of parallel line segments. Trapezoids have only 1 pair of parallel line segments. These few shapes are just quadrilaterals, other polygons also have more than 1 pair of parallel line segments (e.g. regularhexagons, octagons, etc.). Triangles never have any parallel line segments.
Three.