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Forgot Please help

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Forgot Please help [#permalink] New post 16 Nov 2012, 20:36
I saw a formula on this forum but forgot the entire formula and what it is for... can someone pls help me recollect... it looks like x1(y2-y3)+y1(x2-x3)......
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Last edited by Amateur on 19 Nov 2012, 09:38, edited 1 time in total.
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Re: Forgot Please help [#permalink] New post 16 Nov 2012, 21:37
Hero's Formula
There are several ways to find the area of a triangle. Four of the most useful cases are shown below

a, b, & c are known. This is known as "Heron's Formula".
area = sqrt( S(S-a)(S-b)(S-c) ) where S = 1/2 (a+b+c)
a, b, & C are known
area = 1/2 a b sin(C)
a, B, & C are known
area = a^2/2 sin(B)sin(C)/sin(B+C)
The vertices are known
area = 1/2( x1(y2-y3)+x2(y3-y1)+x3(y1-y2) )

http://www.unitmath.com/um/p/Examples/G ... Plane.html
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Re: Forgot Please help [#permalink] New post 17 Nov 2012, 07:06
thank you for the post.... but none in these gupta..... it has a numerator and a denominator.... for some coordinate geometry problem Bunuel posted a answer with explanation and calculation but some other chap posted a formula in the same page which is a lottttt easier.....
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Re: Forgot Please help [#permalink] New post 19 Nov 2012, 09:38
ran in to it once again..... updated my first post with a snapshot of it... Thanks
Re: Forgot Please help   [#permalink] 19 Nov 2012, 09:38
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