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  1. Similar Triangles
  2. areas
  3. pythagoreanTheorem
  4. circles
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  6. threeDimensionalGeometry
  7. trigonometry
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  9. miscellaneous
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Theorem 25
For a square $ABCD, AC=\sqrt2 AB$.
← Back to Exercise 34
proof
$AC^2=AB^2+BC^2=2 AB^2$, so the proof follows.
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