SOLUTION: geometry, area of a triangle given its 3 sides. need proof of Heron formula

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Question 1041009: geometry, area of a triangle given its 3 sides.
need proof of Heron formula
Found 2 solutions by jim_thompson5910, ikleyn:
Answer by jim_thompson5910(35256) About Me  (Show Source):
Answer by ikleyn(52786) About Me  (Show Source):