Cross's Theorem
Construct squares on the sides of the triangle ABC. Join the outward vertices of consecutive squares to form three new triangles. Then all four triangles have the same area.
Contributed by:
Jay Warendorff
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Cross's Theorem.
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Triangle
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"
Cross's Theorem
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http://demonstrations.wolfram.com/CrosssTheorem/
Contributed by:
Jay Warendorff
High School Geometry
Plane Geometry
Triangles
Stewart's Theorem
Viviani's Theorem
Napoleon's Theorem
The Pivot Theorem
The Ratio Theorem
Van Aubel's Theorem for Triangles
Medial Division of Triangles
Largest Isosceles Triangle Inscribed in a Circle
The Area of a Triangle as Half a Rectangle
Side Lengths Opposite Unequal Angles
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