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  1. Similar Triangles
  2. areas
  3. pythagoreanTheorem
  4. circles
  5. quadrilaterals
  6. threeDimensionalGeometry
  7. trigonometry
  8. conic
  9. miscellaneous
  10. exercises solutions
Theorem 26
If $ABCD$ is a parallelogram, then $AB^2+BC^2+CD^2+DA^2=AC^2+BD^2$.
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