Geometry Crossword

2. Two figures that have the same shape but not necessarily the same size.
3. The sum of the lengths of all sides of a polygon.
4. A part of a line that starts at an endpoint and extends infinitely in one direction.
8. An educated guess or hypothesis based on limited evidence.
10. A line segment connecting a vertex of a triangle to the midpoint of the opposite side.
12. d=√((x_2-x_1)²+(y_2-y_1)²)
14. The measure of the amount of rotation needed to bring one line or plane to coincide with or be parallel to another.
15. The point of concurrency of the three altitudes of a triangle.
17. Angles that share a common side and vertex but have no common interior points.
18. The point that divides a line segment into two equal parts.
19. A statement assumed to be true without proof; also known as an axiom.

1. A pair of adjacent angles whose measures add up to 180 degrees.
5. The measure of the amount of space enclosed by a figure.
6. An angle that measures less than 90 degrees.
7. An angle that measures exactly 90 degrees.
9. A straight path that extends infinitely in both directions.
11. A polygon with nine sides.
13. A statement that asserts a relationship between antecedent and consequent.
16. A polygon with six sides.
19. A flat surface that extends infinitely in all directions.