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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 27
For $\triangle ABC, AB^2=AC^2+BC^2-2AC\cdot BC\cdot \cos C$.
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