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geometry basics
adjacent angles
two angles that share a common side and vertex
“next to“ each other
vertical angles
two angles directly across from each other on intersecting lines.
always congruent!
complementary angles
two angles with measures that have a sum of 90 degres
do not have to be adjacent
supplementary angles
two angles with measures that have a sum of 180
linear pairs
adjacent angles that are supplementary combined they create a straight line
perpendicular
two lines that intersect at a 90 degres (right) angle symbol
angle bisector
a line or ray divider an angle into two equal parts