A discussion of the four tangents common to two circles.
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Ask Dr. Math
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This page contains a video tutorial of finding the measures of angles when there are 2 tangents
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Nutshell Math
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.
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Online Math Learning
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This shows examples of problems dealing with circles and tangents
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Geometry Expressions
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This gives step by step instructions on constructing a tangent to a circle through a point not on the circle includes a JavaSketchpad for interaction.
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To draw a tangent to a circle from a given point not on the circle.
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Definition and properties of a tangent
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Math Open Reference
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A discussion of the four tangents common to two circles.
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Ask Dr. Math
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A discussion of a construction of four tangents common to two circles.
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Ask Dr. Math
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