Geometry

3. c=a^2+b^2-2ab cos(C)
4. A chord of a circle is a straight line segment whose endpoints both lie on a circular arc.
9. An arrangement of objects where the order in which the objects are selected does not matter.
12. The amount of outcomes in an experiment.
14. The central angle of an arc is the angle at the center of the circle between the two radii subtended by the arc. Part of the circumference.
17. Angles on opposite sides of a transversal that are in the interior of the two lines.
18. An inscribed angle in a circle is formed by two chords that have a common endpoint on the circle. This common endpoint is the vertex of the angle.
19. Special segment that forms a 30 60 90 when dropped from an equilateral triangle
20. An angle formed by two radii of a circle.Vertex of the angle has to be the center.

1. A straight line segment from the center to the circumference of a circle or sphere.
2. The circumference of a circle is the perimeter of the circle. It is the total length of the boundary of the circle.
5. Corresponding Parts of Congruent Triangles are Congruent.
6. A four-sided polygon, having four edges and four corners.
7. A shape in which all sides are equal and opposite sides are parallel.
8. When there are multiple points all in a straight line on the same line.
10. A plane figure with at least three straight sides and angles, and typically five or more.
11. A shape in which the opposite sides are parallel and equal.
13. A preimage turning around a fixed point
15. An arrangement of objects in a particular way or order.
16. An infinitely thin object on the coordinate plane that is perfectly straight that extends infinitely in both directions.