| Definition | Term/Word |
| the sum of all exterior sides of a polygon | |
| the original figure | |
| the new figure | |
| symbol that goes on the image | |
| transformation in which a figure is turned about a fixed point | |
| transformation that preserves lengths, angle measures, parallel lines, and distances between points | |
| the point about which an object rotates | |
| a quantity that has both direction and magnitude, or size, and is represented by an arrow drawn between two points | |
| the multiplier between the side length ratios | |
| the set of all points in a plane that are equidistant from a given point | |
| the distance from the center to a point on the circle | |
| a segment whose endpoints are points on a circle | |
| a chord that passes through the center of the circle | |
| a line that intersects a circle in two points | |
| a line in the plane of a circle that intersects the circle in exactly one point | |
| the point at which a tangent line intersects the circle to which it is tangent | |
| coplanar circles that have a common center | |
| the distance around a circle | |
| horizontal and vertical grid point on the circle | |
| partial circumference | |
| partial area given a known arc measure | |
| 3.1415926535897932384626433832795028 | |