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Catriona's Pentagons
Author:
John Golden
Topic:
Angles
Mindblowing even by her standards. Original:
https://twitter.com/Cshearer41/status/1207935071568715776
GeoGebra
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Open Education 2026
巧算長方形周界
Perimeter of a Rectangle with Unknown Sides
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AI for worksheet development
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Archimedes ellipsograph
Polygons in polygons
Dilations (A)
Building Similar Rectangular Prisms
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Boxplot
Constructions
Linear Programming or Linear Optimization
Subtraction
Perimeter