Math - Crossword Labs

1. a line that has one endpoint and goes on infinitely in only one direction
4. a dot and named by a capital letter
6. a line or ray that divides an angle into two congruent angles
7. the basic structure from which lemmas and theorems are derived
8. to the opposite of another operation.
12. if their corresponding angles are congruent
13. the angle bounded by two lines perpendicular to each other
16. infinitely long collection of points extending in two opposite directions
17. a plane figure with ten straight sides and angles.
18. a proposition or statement that is demonstrated.
19. a parallelogram also has two pairs of equal-length sides, but they are opposite to each other

2. the perpendicular segment from a vertex of a triangle to the opposite side
3. the distance around the edge of a shape.
5. a line that intersects two or more other lines.
6. used to define the amount of space taken up by a 2D shape or surface.
9. exceeding 90 degrees but less than 180 degrees.
10. gives the distances between pairs of points in terms of their coordinates
11. a pair of adjacent angles formed when two lines intersect.
14. a point at or near the middle of, or equidistant from, both ends, as of a line
15. a flat, two-dimensional surface that extends infinitely far.