names a location
a perfectly flat surface that extends forever in all directions.
a part of a line that starts at on point and extends forever in one direction.
a segment, or line segment, is the part of a line between two points.
perfectly straight and extends forever in both directions.
formed by two rays with common endpoint called the vertex.
measures 90 degrees.
measures greater that 0 degrees but less than 90 degrees.
measures greater than 90 degrees and less than 180 degrees.
two angles whose measure add up to 90 degrees.
two angles whose measures add up to 180 degrees.
figures that have the same size and shape.
are always congruent.