They make a pair of acute angles and a pair of obtuse angles. In rotational order, the angles are acute, obtuse, acute, obtuse.
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a secant
Twelve line segments are in a cube
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---
They are perpendicular line segments
Line segments are congruent if they have the same length.