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What is a midpoint?
a point that divides the segment into 2 congruent parts
What does it mean to bisect an angle or segment?
bisect means to divide a segment into 2 congruent parts
What are skew lines?
non-coplanar lines that never intersect
If you know the slopes of 2 lines, how can you tell they are parallel?
They must have the same slope.
If you know the slopes of 2 lines, how can you tell they are perpendicular?
They must have opposite signs and reciprocal slopes.
What are the 5 postulates to prove triangles are congruent?
SSS
SAS
AAS
ASA
HL