Episode 20 — Analytical Geometry

Length of a Tangent to a Circle

Learners will be able to:

• Identify the equation of a circle and its center from a given equation. • Complete the square on a quadratic expression in two variables to find the center and radius of a circle. • Sketch a diagram of a circle with its center and radius labeled. • Use the distance formula to calculate the length of OA. • Apply Pythagoras' theorem to calculate AB.