Heron's Formula

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When given three sides of a triangle, a, b, c. The area A of the triangle is given by:


  • Area \large%20\ A= sqrt[s(s-a)(s-<img src='http://www.piping-designer.com/board/public/style_emoticons/default/cool.png' border='0' alt='user posted image' />(s-c)]

Pythagorean Theorem

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The hypotenuse is the sum of the squares of the other two sides.


  • \large%20\ c^2= a^2+b^2

Semiperimeter

Space
  • Perimeter \large%20\ p = a+b+c
  • Semiperimeter \large%20\ s \equiv \frac{1}{2} p
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