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Tangent to a Circle

Mathematics · Class 12

A tangent is perpendicular to the radius at contact; use the radius slope or tangent formula.

Tangent to a circle
rule
worked example
Tangent to a circle: A tangent is perpendicular to the radius at contact; use the radius slope or tangent formula.
CONCEPT AND RULE: A tangent is perpendicular to the radius at contact; use the radius slope or tangent formula.
METHOD: For tangent to a circle, identify the given information and required result. Select the matching def
A tangent is perpendicular to the radius at contact; use the radius slope or tangent formula.
Worked pattern: For x^2+y^2=25 at (3,4), tangent is 3x+4y=25.

Right triangle — Tangent to a Circle — original sketch for this lesson (not copied from a textbook).