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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 51
For a trapezoid $ABCD$, with $AB//CD$, if $M $ and $N$ are the midpoints of $AD$ and $BC$ respectively, then $MN//AB, MN=\frac12(AB+CD)$.
← Back to Exercise 208
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