20 terms

# Definitions

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have the same size and shape.
Congruent -
segments that have equal lengths.
Congruent segments -
point that divides the segment into two congruent segments.
Midpoint of a Segment -
line, segment, ray, or plane that intersects the segment at its midpoint.
Bisector of a Segment -
angles that have equal measure.
Congruent Angles -
two angles in a plane that have a common vertex and a common side but no common interior points.
ray that divides the angle into two congruent adjacent angles.
Bisector of an Angle -
two angles whose measures have the sum 90.
Complementary Angles -
two angles whose measures have the sum 180.
Supplementary Angles -
two angles such that the sides of one angle are opposite rays to the sides of the other angle.
Vertical Angles -
coplanar lines that do not intersect.
Parallel Lines -
noncoplanar lines that are neither parallel or intersecting.
Skew Lines -
line that intersects two or more coplanar lines in different points.
Transversal -
two nonadjacent interior angles on opposite sides of the transversal.
Alternate Interior Angles -
two interior angles on the same side of the transversal.
Same-Side Interior Angles -
two angles in corresponding positions relative to the two lines.
Corresponding Angles -
two lines that intersect to form right angles.
Perpendicular Lines -
points all in one line.
Collinear Points -
lines on the same plane.
Coplanar Lines -
points on the same plane.
Coplanar Points -