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sum of two angles up to 90 degrees
sum of two angles measure 180 degrees
pair of opposite congruent (equal) angles formed by intersecting lines
2 lines that never cross/intersect and stay the same distance apart
line that intersects 2 parallel lines
angle on the inside of intersected parallel lines
angle on the outside of intersected parallel lines
2 angles in matching corners.
alternate interior angle
2 interior angles on opposite sides on the transversal that have the same measure.
alternate exterior angle
2 exterior angles on opposite sides of the transversal that have the same measure
angles that have the same measures