Geometry Vocabulary

2. A Euclidean, two-dimensional surface that extends indefinately
4. A plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain
5. A line or a line segment that divides an angle into two equal parts
8. A statement which is taken to be true without proof
9. Shows how many times one number contains another
10. A plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square
11. A quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral
13. A primitive notion that models an exact location in space, and has no length, width, or thickness
16. A quadrilateral with at least one pair of parallel sides. In British and other forms of English, it is called a trapezium.
17. A line or a line segment that divides a given line segment into two equal parts

1. Part of a line that consists of two points called endpoints and all points between them
2. A simple quadrilateral with two pairs of parallel sides
3. A polygon with three edges and three vertices
4. A part, share, or number considered in comparative relation to a whole
6. A formula, proposition or statement in mathematics or logic deduced or to be deduced from other formulas or propositions
7. A regular polygon having four equal sides and equal angles that measure 90°
12. The point on a line that is at an equal distance from either end
14. A shape consisting of all points in a plane that are at a given distance from a given point, the center.
15. An infinitely long object with no width, depth, or curvature
18. The part of a line that contains an endpoint and all points extending in the other direction