The Argand plane: geometry, loci and regions

What this note covers

1. Points, vectors and distance
2. Circles in complex notation
3. Perpendicular bisectors and lines
4. Rays and argument conditions
5. Triangle inequality
6. Intersecting loci
7. Worked locus studio: derive a bisector and intersect a directed ray
8. Complex-plane regions: inequality boundaries and triangle geometry

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