Geometry

2. -A triangle that contains only angles that are less than 90 degrees.
9. -If B is between A and C, then AB + BC = AC
11. -lines in the same plane that never intersect
15. -a pair of adjacent angles whose noncommon sides are opposite rays.
17. -points that lie on the same line
19. -A pair of opposite congruent angles formed by intersecting lines
20. -If a hypotenuse and leg of one right triangle are congruent to the corresponding hypotenuse and leg of a second right triangle, then the triangles are congruent.

1. -Angles formed by a transversal cutting through 2 or more lines that are in the same relative position.
3. -a ray that divides an angle into two congruent angles
4. -two angles whose sum is 180 degrees
5. -A point that divides a segment into two congruent segments
6. -lines that intersect to form right angles
7. -two angles whose measures add to 90 degreees
8. -If P is in the interior of <RST, then m<RSP + m<PST = m<RST
10. -a line that intersects two or more coplanar lines at different points
12. -A triangle with one angle that is greater than 90 degrees.
13. -points that lie on the same plane
14. -a segment, ray, line, or plane that intersects a segment at its midpoint
16. -Two angles that share a common side and have the same vertex
18. -a part of a line with two endpoints