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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.

Adjacent Angles -

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 -