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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 37
$ABCD$ is cyclic if and only if $\angle BAD+\angle BCD=180^\circ$.
← Back to Problem 97
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