geometry

2. Lines / Lines that do not intersect and are not coplanar.
3. Reasoning /Method of drawing conclusions from a limited set of observations.
5. Interior angle / Angles between the two lines and on the same side of the transversal.
8. /a line that intersects at least two other lines.
9. /Interchanging and negating the hypothesis and conclusion of a statement.
10. Lines / two lines that intersect to for a right angle.
12. Interior Angles /angles inside the lines and on opposite sides of the transversal.

1. Reasoning /method using logic to draw conclusions based upon definitions, and theorems.
4. /interchanging the hypothesis and conclusion of a statement.
6. Angles / angles in matching positions when a transversal crosses at least two lines.
7. /specific case for which a conjecture is false.
10. /a justification logically valid and based on assumptions and theorems.
11. Lines / Lines that do not intersect and are coplanar.