Write: A for Definition
B for Postulate
C for Theorem
1. A line contains at least two points.
2. Two angles formed by intersecting lines and facing in the opposite direction. 3. Through any two points, there is exactly one line.
4. If two sides of a triangle are equal then two angles are equal.
5. A plane contains at least three non-collinear points. _
6. If a triangle is equilateral, then all sides are equal.​