### Quick Check

Based on the definitions from section one, answer the following questions.

Geometry is so much about what you can see and the relationships various figures have with one another. What you see, what you infer, what is obvious, what you accept, what you define, what you assume, and what you can prove are all integral parts of geometry. Developing an understanding for how undefined terms, definitions, postulates, and theorems relate is fundamental to your continued success in geometry.