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The Fifth Postulate
Author:
Andy Norton
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Bottema's Theorem
History of Maths
Stairs (Optical Illusion)
Angles and Intersecting Lines: Quick Investigation
Ellipse, Hyperbola and Circle as Envelopes
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Adding Complex Numbers
Focus Parabola
Figure 6 Hinged octagons and squares
Вращение многоугольников
Average to Instantaneous Velocity
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Variance
Perimeter
Translation
Diagrams
Exponential Functions