Level 79
Level 81

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complimentary angle

sum of two angles up to 90 degrees

supplementary angle

sum of two angles measure 180 degrees

vertical angle

pair of opposite congruent (equal) angles formed by intersecting lines

parallel lines

2 lines that never cross/intersect and stay the same distance apart

transversal line

line that intersects 2 parallel lines

Interior angle

angle on the inside of intersected parallel lines

Exterior angle

angle on the outside of intersected parallel lines

corresponding angle

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

congruent angle

angles that have the same measures