A fixed point from which a figure is turned.

The fixed point from which a figure is turned is called the center of rotation.

A transformation that involves the circular turning of a figure around a fixed central point.

The transformation that involves the circular turning of a figure around a fixed central point is called a rotation.

A two-dimensional graph created when a horizontal number line intersects with a vertical number line

A two-dimensional graph created when a horizontal number line intersects with a vertical number line is called a coordinate plane or a Cartesian plane.

Two or more lines that move in the same direction and never intersect.

Two or more lines that move in the same direction and never intersect are called parallel lines.