Geometry End of Year

2. a line segment that goes from one corner to another, but is not an edge
3. a segment that connects the midpoints of any two sides of a triange
6. a line segment that has both endpoints on a circle
8. the distance around a 2-dimensional object's exterior
9. property that states if x=y and y=z then x=z
10. the event in which both the first AND second event occur
12. a point on line segment that divides it into two equal parts. The half way point of a line segment
15. what it's called when two lines meet each other at a 90 degree angle
17. means to divide into two equal parts, dividing line is called a bisector.
18. a line perpendicular to the circle's radius
20. property that says the measure of any side or angle is equal to itself

1. a rigid transformation that involves turning an entire figure around a fixed point
4. property that states if x=y, then y can be substituted in for x in any expression
5. the event in which the first OR second event occur
7. a transformation that maintains the shape of the figure but multiplies its dimensions by a chosen factor
11. a rigid transformation that involves flipping a figure over the line of reflection
13. formed by two radii of a central angle and the arcc between their endpoints on the circle
14. set of points a fixed distance from a center and is defined by a central angle
16. when the outcome of one event does not change the outcome of the other
19. the number of square units needed to fill up a region on a flat surface