basic geometric ideas

4. A three-sided polygon.
5. Describing two distinct lines that meet at a single point.
6. It determines a location and is usually denoted by a capital letter.
7. Lines in a plane that never meet, no matter how far they are extended.
8. The line segment joining two non-adjacent vertices of a polygon.
12. The fixed distance from the center to any point on a circle.
13. A portion of a line that starts at a point and goes endlessly in one direction.

1. A chord that passes through the center of a circle.
2. The region of a circle enclosed by an arc and a chord.
3. The meeting point of a pair of sides in a polygon.
6. A simple closed curve made up of line segments.
9. This is formed by two rays starting from a common end point.
10. Any drawing done without lifting the pencil; a line is also considered one.
11. A line segment joining any two points on a circle.