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# 5.5: Heron's Formula

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English

Heron's Formula

Heron's formula is used to calculate the area of a triangle when the lengths of all three sides are known. Heron's formula states that for a triangle with sides $a$, $b$, and $c$, the area of the triangle is $A=\sqrt{s(s-a)(s-b)(s-c)}$ where $s=\frac{a+b+c}{2}$.

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