Geometry

5. The line segment between two points on a given curve.
6. Greater than 90 degrees but less than 180 degrees
7. The circumcenter of a triangle is the point where the three perpendicular bisectors meet. This point is the same distance from each of the three vertices of the triangles.
9. 90 degree angle.
10. All sides are equal and all angles equal.
11. A position in space.
12. The largest possible circle that can be drawn interior to a plane figure. For a polygon, a circle is not actually inscribed unless each side of the polygon is tangent to the circle.
13. A quadrilateral having both pairs of opposite sides parallel to each other.(Note: squares and rectangles are also quadrilaterals.)
18. A straight line extending from the center of a circle or sphere to the circumference or surface.
19. A polygon with 5 sides and 5 angles.
21. A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end.

1. A polygon with four sides.(Note: squares, rectangles and trapezoids are also quadrilaterals.)
2. Two sides are equal.
3. A line segment, line, or plane that divides a geometric figure into two congruent halves.
4. The intersection point of two sides of a plane figure.
8. A quadrilateral plane figure having two parallel and two nonparallel sides.
14. A parallelogram having four right angles.(Note: a square is also a rectangle.)
15. A continuous extent of length.
16. A polygon having eight angles and eight sides.
17. An equilateral parallelogram having oblique angles.
20. A polygon having six sides and six angles.
22. The part of a straight line considered as originating at a point on the line and as extending in one direction from that point.