Geometry Vocabulary A

4. A polygon with four sides, four interior angles and four vertices.
5. A straight line segment that passes through the center of the circle and whose endpoints lie on the circumference of the circle.
6. Lines Two intersecting lines that form four right angle at their point of intersection.
8. A line segment that joins two points on the circumference of the circle.
10. A quadrilateral in which all the angles are equal and the opposite sides are equal and parallel.
11. A quadrilateral with only one pair of parallel sides.
13. A line segment that connects the center of a circle to its circumference.
14. Lines Lines that cross or meet each other at a single point.
16. A part of a line with one endpoint that extends infinitely in one direction.
17. A common point where two rays meet
18. Triangle A triangle in which one angle is 90°
19. An alignment of sets of points on a straight path that extends infinitely, goes on forever, in opposite directions.
20. A flat surface extending infinitely in all directions, with no thickness or curvature.

1. A polygon with 3 sides and 3 interior angles.
2. Lines on the same plane that are always the same distance apart and never intersect
3. A part of a straight line that has two distinct endpoints.
7. A quadrilateral with four congruent sides and two pairs of opposite sides are parallel.
9. A quadrilateral in which the opposite sides are parallel and equal.
12. An exact location in space. Looks like a dot.
15. A quadrilateral with four equal sides, four right angles and two pairs of opposite sides are parallel.