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S0G4L2 到两点距离的运算值为定值2：四类运算的切换
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学用数学
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Open Middle: Diagonal of a Rectangular Prism
Fractal Hand Turkey
Open Middle: Pythagorean Theorem (1)
Triangle Fractal Time-Waster
Plane & Sphere Intersections
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Equal Distant Perimeter Points
Scalene Tesselation
pltw
Chapter 2 Activity 6
Angles Formed by Chords Intersecting Inside a Circle
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Trigonometry
Inequalities
Similarity Transformation or Similarity
Stochastic Process or Random Process
Real Numbers