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William Richards

  • Reflection across a line

    Activity

    William Richards

  • Triangle-Angle Bisector Theorem

    Activity

    William Richards

  • Triangles: Median and Centroid Animation

    Activity

    William Richards

  • Triangles: Midsegments

    Activity

    William Richards

  • Triangle: Perpendicular Bisectors

    Activity

    William Richards

  • Triangle Sum Theorem

    Activity

    William Richards

  • Range of Possible Triangle Side Lengths

    Activity

    William Richards

  • Triangle Exterior Angle Theorem

    Activity

    William Richards

  • Triangle Exterior Angle Theorem

    Activity

    William Richards

  • Properties of Isosceles Triangles

    Activity

    William Richards