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Altitudes of a triangle
Author:
István Makai
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Volume of an Open Box
Forming Rectangles with Squares
Regular Tessellation {3,6}
Organic Ellipse
Open Middle: Horizontal and Vertical Distances (V2)
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Pythagorean to Fermat
Figure 5 Hinged hexagons, empty triangles
Jason Tracy
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รูปคลี่พีระมิด
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Differential Calculus
Intersection
Exponential Functions
Kite
Constructions