Tag Archives: Heron triangles

Heron triangles & half-angle formulae

  Prove that If the sides of a triangle are in arithmetic progression if and only if the cotangents of its half-angles ,    ,    are also in arithmetic progression   Also,   if and only if       … Continue reading

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Heron triangles (17, n, n+3), (17, n, n+5) and (17, n, n+1)

  Older post:   Heron triangles (17, n, n+3) and (17, n, n+5)   Here are the first few examples:                                

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