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Desargues's theorem in 3D
Author:
Steve Phelps
Desargues's theorem states two triangle are in perspective axially if and only if they are in perspective centrally. A proof is easy to see in 3D.
GeoGebra
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Vectors: Scalar Multiplication
Weighing Scales (g): Practice
Weighing Scales (kg & g): Practice
Erdős's problem #503, n=3
Use a matrix with its elements as functions
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Semicircle_In_Rectangle-2
Lab #2
Pinhole Camera
Euler line
isosceles triangle investigation
Angle bisecting construction
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Inequalities
Tangent Line or Tangent
Polynomial Functions
Functions
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