Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.
Online Math Learning
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This shows examples of problems dealing with circles and tangents
Geometry Expressions
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Definition and properties of a tangent
Math Open Reference
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This page shows the properties of tangents circumscribing a circle and gives users several practice problems with worked solutions.
Math Warehouse
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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.
Math Open Reference
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