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圓規(Compass)

Author:黃紹東, Michael Borcherds

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Proving Triangles Similar by Dilation
Line Through Two Points and Slope
Thales' Intercept Theorem
Folding door
Proving Triangles Similar: Multistep Transformations

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Congruent Triangles
Euclid Book IV 11
Poster #5
Differentiation, the Gradient Function

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Means
Geometry
Conditional Probability
Stochastic Process or Random Process
Straight Lines

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