Heron’s formula

The area of a triangle with side lengths $a,b,c$ is

$$\mathrm{△}=\sqrt{s(s-a)(s-b)(s-c)}$$

where $s=\frac{a+b+c}{2}$ (the semiperimeter).

Title	Heron’s formula
Canonical name	HeronsFormula
Date of creation	2013-03-22 11:43:54
Last modified on	2013-03-22 11:43:54
Owner	drini (3)
Last modified by	drini (3)
Numerical id	11
Author	drini (3)
Entry type	Theorem
Classification	msc 51-00
Classification	msc 11A51
Classification	msc 55-01
Classification	msc 55-00
Related topic	Triangle
Related topic	BrahmaguptasFormula