This gives step by step instructions on constructing a tangent through a point on a circle includes a JavaSketchpad for interaction.
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To draw a tangent to a circle through a given point on the circle.
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This gives step by step instructions on constructing the center of a given circle includes a JavaSketchpad for interaction.
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To find the center of a given circle or of a circle of which an arc is given.
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This gives step by step instructions on constructing a circle given three points includes a JavaSketchpad for interaction.
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To construct a circle given three points.
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Tangents, secants, their arcs and angles: theorems
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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.
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Math Open Reference
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An explanation and demonstration of the theorem explaining the relationship of two intersecting chords in a circle.
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Open Math Reference
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Easy circle geometry reference with a few interactive examples.
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Mrs. Glosser's Math Goodies
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Nice quick reference on circle geometry.
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Math for Morons Like Us
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