Easy
medium
100
lines that never touch
What is parallel
100
the point in the middle of a line
What is midpoint
200
at an angle of 90 to a give line plane or surface.
What is perpendicular
200
a line or plane that bisects an angle or line segment.
What is bisector
300
coinciding at all points when superimposed
What is congruent
400
two or more angles that add up to 90
What is complementary angles
500
two or more angles that add up to 180
What is supplementary angles
M
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