Joel's Geometry Vocabulary

4. The common endpoint shared by two rays forming an angle.
8. A mapping of a geometric figure, including translations, rotations, reflections, and dilations.
11. A closed plane figure formed by three or more straight sides.
12. The set of all points in a plane equidistant from a given center point.
13. A statement accepted as true without proof, acting as a foundation for reasoning.
14. Points that lie on the same straight line.
15. A three-sided polygon, classified by sides or angles.

1. A line that intersects two or more lines at different points, often used with parallel lines.
2. Figures or segments that are identical in form, size, and shape.
3. Lines or planes that intersect at a right angle (90°)
5. Points or lines that lie on the same plane.
6. A point, line, or ray that divides a segment or angle into two equal parts.
7. A figure formed by two rays sharing a common endpoint, measured in degrees or radians.
9. The exact middle point of a line segment, separating it into two congruent segments.
10. A 3D solid where all points on the surface are equidistant from the center.