isometry
a transformation that preserves length
angle
formed by two rays with a common endpoint
radius
the fixed distance from the center of a circle
ray
part of a line with one endpoint
line
a straight path that extends infinitely in both directions
parallel lines
lines that never intersect
circle
the set of all point in a plane that are a fixed distance from a given point (the center)
transformation
operations that after the form a figure
perpendicular lines
two lines that intersect to form right angles
polygon
a closed plane figure for which all sides are line segments
line segment
part of a line with two endpoints
intersecting lines
lines that cross over each other
point
a location on a flat plane