Circle Theorem: Tangent Meets a Radius at 90°
(KS3, Year 8)
The tangent to a circle makes 90° with the radius which it meets at the point at which it touches.

circle theorem tangent radius 90 degrees

Lesson Slides

The slider below shows real examples which use the circle theorem where a tangent meets a radius at 90°.
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This page was written by Stephen Clarke.