Which system or structure consists of both defined and undefined terms, axioms or postulates, and theorems?

2. What component of a mathematical system consists of a point, a line, and/or a plane?

Which of the statements are assumed to be true without proof?

4. Which of the statements is proven from definitions, postulates, or using operations and facts that were already known?

What component of a mathematical system includes a category or has definition such as a ray and an angle?