an unproven statement that is based on observations
has no dimension. usually represented by a small dot
extends in one dimension. usually represented by a straight line with two arrowheads to indicate that the line extends without end in two directions
extends in two dimensions. usually represented by a shape that looks like a tabletop or wall
part of a line that consists of two endpoints and all points on the line that are between the endpoints
part of a line that consists of an initial point and all points on the line that extend in one direction
the starting point of a ray
rules that are accepted without proof. also called axioms
segments that have the same length
angles that have the same measure
an angle with measure between 0 and 90 degrees
an angle with the measure between 90 and 180 degrees
an angle with measure equal to 90 degrees
an angle with measure equal to 180 degrees
a segment, ray, line, or plane that intersects a segment at its midpoint
a ray that divides an angle into two adjacent angles that are congruent
two angles whose sides form two pairs of opposite rays
two angles whose measures have the sum of 90 degrees
two angles whose measures have the sum of 180 degrees
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