A triangle rotates in the foreground atop a regular polygon with vertices on the unit circle. The area of the polygon is displayed.
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Signed Area of a Polygon
Bruce Atwood (Beloit College) and Stan Wagon (Macalester College)
Bisecting the Area and Perimeter of a Triangle
The Excentral Triangle and a Related Hexagon
Area of a Triangle
Rational Triangles with Area Less than 102
Generalized Pythagoras Theorem
Another Generalization of Pythagoras's Theorem
Da Vinci's Proof of the Pythagorean Theorem
Area of a Quadrilateral by Triangulation
Alvaro Jose Ibarra Rivas (Institucion Educativa Santa Fe, Santiago de Cali - Colombia)
Dividing a Triangle by Lines Parallel to Two Sides
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