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selection task 3
Author:
Arthur Lee
找出平行線，把它們移到右邊。
GeoGebra
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Tracing an Ellipse Using Two Circles
Rolling a Square
Parallel Lines and Angles: Thinking Classroom Exploration
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Triangle_AlexStevens
Esfera d'Ewald
Harris, B1, reflection
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twansine
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Random Experiments
Combinatorics
Polygons
Intersection
Piecewise Functions