Geometry Terms

1. A polygon with four sides.
3. A flat surface that extends endlessly in all directions.
6. A straight line passing through the center of a circle or sphere meeting at the circumference or surface at each end.
8. The intersection point of two sides and angles.
9. The line segment between two points on a given curve.
11. The part of a straight line considered as originating at a point on the line and is extending in one direction from the point.
13. An equilateral parallelogram having oblique angles.
17. A polygon having six sides and six angles.
18. A parallelogram having four right angles.
20. and angle with more than 90 degrees but less than 180.
21. Two line segments which cross to form 90 degree angles.
22. A rectangle having all four sides of equal length.
23. A polygon having eight sides.
24. An angle less than 90 degrees but more than 0.
25. Two angles are this when their sum is 90 degrees.

2. A continuous extent of length
4. Consists of two rays that have a common endpoint called the vertex.
5. A close plane curve consisting of all points at a given distance from a point within it called the center.
7. A polygon with 5 sides and 5 angles.
10. A 90 degree angle.
12. A quadrilateral plane figure having two parallel and two nonparallel sides.
14. Two angles are this if the sum of two angles are 180 degrees.
15. A quadrilateral having both pairs of opposite sides parallel to each other.
16. A position of space.
19. This happens when two lines cross.