William Richards – Resources – GeoGebra

Reflection across a line
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William Richards
Triangle-Angle Bisector Theorem
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Triangles: Median and Centroid Animation
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Triangles: Midsegments
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Triangle: Perpendicular Bisectors
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Triangle Sum Theorem
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Range of Possible Triangle Side Lengths
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William Richards
Triangle Exterior Angle Theorem
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Triangle Exterior Angle Theorem
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William Richards
Properties of Isosceles Triangles
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William Richards