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Challenge 65: Tangent Circles and Angle Chasing by Breart
Author:
Shenghui Yang
Topic:
Circle
GeoGebra
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Construct a Conic
Icosahedron1
Addition of Vectors
Subtraction of Vectors
Shadow of a Cube (v2)
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Graphing Trig
Proposition 35
Factoring Polynomial
octaedro
Hole 4
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Pythagoras or Pythagorean Theorem
Rational Numbers
Linear Equations
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