geometry

3. a ? bisector is a segment, ray, line, or plane that intersects a segment at its midpoint.
6. an angle bisector is this kind of geometric figure.
9. a theorem is a true statement that follows from other ? statements
11. adjacent angles have a ? vertex
12. contains the "then" part of an if-then statement
13. two angles that have in common vertex and side but no common interior points.

1. this type of statement contains a hypothesis and a conclusion
2. two angles ? states that if two are supplementary to the same angle
4. the property that states that if a=b, then b=a
5. two angles the sum of whose measures 90 degrees.
7. divides into two congruent parts
8. the congruent supplements ? states that if two angles are supplementary to the same angle then they are congruent
10. of adjacent angles whose non-common sides are on the same line
14. the midpoint of a segment is divided it into this many congruent parts