The equation of a circle
x² + y² = r² for a circle centred at the origin, points on it, and the tangent at a point.
You will be able to
- Write the equation of a circle centred at the origin
- Decide whether a point is on, inside or outside a circle
- Find the equation of the tangent at a point
25 minutes, 7 exam-style questions, with the Graphing Calculator.