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Re: Jerry Katzman, the area of the triangle
Posted:
Jan 24, 2008 12:22 AM


You probably mean Heron's formula
S^2 = s(s  a)(s  b)(s  c),
where
a, b, c are the sides, s = (a + b + c)/2, the semipermeter, S the area of the triangle.
See, for example,
http://www.cuttheknot.org/pythagoras/corollary.shtml#heron
A. Bogomolny



