indicates location in space and has no size.
a series of infinite points that extends forever in opposite directions.
a flat surface that extends infinately in all directions
two lines in the same plane that never intersect
formed by two rays with a common endpoint called the vertex
an angle whose measure is exactly 90 degrees
an angle whose measure is exactly 180 degrees, an angle that forms a straight line
where two rays have a common end point
a part of a line with one endpoint and all the points of the line on one side of the endpoint
a finite portion of a line.
two lines in the same plane that share a single point
lines that do not exist in the same plane. They are neither intersecting or parallel
an angle whose measure is less than 90 degrees
an angle whose measure is greater than 90 degrees and less than 180 degrees
two angles whose combined measures add up to 90 degrees
two angles that share a common ray (vertex and side) but have no interior points in common
two angles that are opposite each other when two lines intersect. also known as opposite angles
a triangle with 3 acute angles
a triangle with one obtuse angle
a triangle with at least 2 congruent sides
two angles whose combined measures add to 180 degrees
a triangle with one right angle
a triangle with sides of different lengths
a triangle with 3 congruent sides