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alternative triangle angle sum proof
Author:
macdivittphil
GeoGebra
New Resources
A note on Erdős’s mysterious remark
Roll 6d five times
Experiments with Transformations in the Plane
以竹簽拼砌三角形
Flip 4 Coins
Discover Resources
Mystery Transformations 3
上下和
AudreyLorence(page25)
Proof: Equal chords, equidistant from centre
Reflection in a Point with Menu: You Do it!
Discover Topics
Cylinder
Plane Figures or Shapes
Sphere
Random Variables
Correlation