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vitalja
GeoGebra
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探究由平行線和截線所成的角
Poorly Drawn Parallelograms
What is an Isogonal Conjugate?
Poorly Drawn Parallelograms 3
alg2_05_05_01_applet_exp_2_flvs
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Testing Concyclic
Problem 147
Kennedy_Ceva
Tangram Puzzle Challenge
A.4.4.1 Notice and Wonder: Two Functions