PRACTICE EXERCISE 1: Determine whether each of the following represents the idea of a point, a line or 1. The tip of a pen 2. The corner of a box 3. One string of a guitar 4. A laser beam 5. A parking lot 6. The runway at NAIA 7. A shadow 8. Venetian blinds 9. The stars in the night sky 10. A page of a book​