Distance Formula and how to apply it

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The distance formulae can be applied in coordinate geometry when trying to identify the length of a side when given two points.

The formula is:

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The distance formula can be used to identify the length of a side of a polygon on a coordinate plane. it's formula is:

Lets look at an example:

A(-1,5) . B((3,3) C(6,-4) D (2,-2) . Find the length of side AD.

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Lets apply the distance formula from before:

So therefore, the length of AD = 7.6

Question: Find the Length of DC