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https://www.mathsisfun.com/pythagoras.html

It is called "**Pythagoras**' **Theorem**" and can be written in one short **equation**: a^{2} +

b^{2} = c^{2} ... The longest side of the **triangle** is called **the "hypotenuse**", so the

formal definition is: ... Let's **see** if it really works **using** an example. ... If we **know**

**the** lengths of two sides of a **right** angled **triangle**, we can **find** the length of the

third side.

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