radius
A line segment with one endpoint at the
center of a circle and the other endpoint on the circle
Example:
 |
radius |
ray
A part of a line, with one endpoint, that
continues without end in one direction
Example:
ray CD
rectangle
A parallelogram with four right angles
Example:
rectangular prism
A solid figure in which all six faces are
rectangles
Example:
reflection (flip)
A movement of a figure to a new position by
flipping it over a line
Example:
regular polygon
A polygon in which all sides are congruent
and all angles are congruent
Examples:
