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parallel lines
two lines that never intersect and are coplanar
skew lines
two lines that never intersect and non-coplanar
rays
a half line with the endpoint included
line segment
a subset of a line w/ two endpoints
perpendicular lines
two lines that intersect and form a right angle
angle
two rays with a common endpoint (ray=side, endpoint=vertex)
adjacent angles
share a common ray
degree
1/360th of a revolution
supplementary pair of angles
two angles that add up to 180 degrees
complementary pair of angles
two angles that add up to 90 degrees
vertical angles
when two lines intersect, a pair of angles that are nonadjacent to each other must be vertical