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sum of inner angles of a polygon-proof-2

Author:zacharias thomas

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Experiments with Transformations in the Plane
以竹簽拼砌三角形
A note on Erdős’s mysterious remark
Flip A Bunch of Coins
bewijs stelling van Pythagoras

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elmtv-805-0115hL-2
Transformation Reflection
Area model for dividing multi-digit numbers
SUM OF N TERMS
Angle Relationships

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Plane Figures or Shapes
Planes
Statistical Characteristics
Line Segment
Real Numbers

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