Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

anonimnystefy
2012-11-06 01:43:35

You are welcome!

Agnishom
2012-11-06 01:40:53

Yes! smile Thanks to bob bundy and anonimnystefy

anonimnystefy
2012-11-06 00:39:44

You can do it like this:

CD<AC+AD<(AB+BC)+AD. Q.E.D

Agnishom
2012-11-06 00:25:36

Tried...But how do I get rid of the diagonal in the equation?

bob bundy
2012-11-06 00:14:37

hi

Split your quadrilateral into two triangles and use the triangle inequality twice.

Bob

Agnishom
2012-11-06 00:07:11

Prove that in a quadrilateral ABCD,
AB + BC + CD > DA

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