Lines, line segments, spheres and parametric curves; do the paths cross or do the particles meet?

What this note covers

1. Vector equations of lines and segments
2. Relationships between two lines
3. Spheres
4. Particles moving along lines: do the paths cross, do they meet?
5. Parametric curves and their Cartesian equations
6. Exam technique for lines, spheres and particles

6 sections · 10 key terms & formulas · 6 common mistakes