Paper 2 · Co-Ordinate Geometry of the Circle
⏱ Tested in 2 exam questions since 2018
Lesson 4 of 5
LCOL Co-Ordinate Geometry of the Circle 4 : Equation of a tangent to a circle
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- At the point of contact, the radius is PERPENDICULAR to the tangent
- Slope of the radius (centre to the point) using (y₂−y₁)/(x₂−x₁)
- Perpendicular slope = INVERT the fraction and CHANGE the sign
Most recent exam questions
- 2020 P2 Q4(b)
- 2018 P2 Q4(d)
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