MATSEC AM Pure Mathematics Complete Prep Course — Lesson 37: Tangents and contact of circles

Sarah Mitchell derives the tangent at a point on a circle from the perpendicular radius property, then finds tangents of a given gradient using the perpendicular distance from the centre and the zero discriminant test. She covers the two equal tangents from an external point, and the tests for external contact, internal contact and orthogonality of two circles. Worked examples cover a tangent line y equals two x plus k and two circles that touch externally.

Lesson 37 of 158 in the MATSEC AM Pure Mathematics Complete Prep Course audio course from ExamPrepRise.

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