Coordinate geometry basics
Equation of straight line: y = mx + c. Gradient m = (y₂ – y₁)/(x₂ – x₁). Midpoint = ((x₁+x₂)/2, (y₁+y₂)/2).
Circle
(x – a)² + (y – b)² = r². Centre at (a, b), radius r.
Exam habits
- Draw a sketch whenever possible.
- Label axes clearly, especially for intercepts.
- Check if answer requires exact form (fractions, surds).
#O-Level#Elementary Mathematics#Coordinate Geometry
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