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треугольники Марк Суменков
Author:
mark.sumenkov
,
natalja.artamonova
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Tangram
[教学] 丢铜板的机率实验
[eqc]: Что сказал Иисус Христос [gm]
Curve
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Varignon's theorem (Sandra Ollerhead)
DTS Task #1
Triangle Centers
Special Angles in Standard Position: Intro (V2) - Part 2