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#76 Triangles and altitudes on a triangle
作者：
Doug Kuhlmann
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三角形
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GeoGebra
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apec
拼砌四邊形 - 工作紙
MC #2
z`]]
Forming Similar Triangles
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Pythagorus
Triangles on the same base and between the same parallels___
Cylindrical Shell Action!!! (1)
Task 3.2.4 Trapezium in a Circle
Problema 5 dreptunghi
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