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A helpful scientific calculator that runs in your web browser window.

Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.

This shows examples of problems dealing with circles and tangents

Definition and properties of a tangent

This page shows the properties of tangents circumscribing a circle and gives users several practice problems with worked solutions.

An interactive explanation of the mathematical relationship between two secants that intersect outside the circle. Also explained is the relationship between a tangent and secant that intersect.