diff --git a/guide/english/mathematics/perimeter/index.md b/guide/english/mathematics/perimeter/index.md
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 ## Perimeter
 
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+Perimeter is the measure of the distance around a shape. It can also be described as the sum of the lengths of all the sides and curves that form a shape. Likewise, in order to get the perimeter of a shape, you first measure the length of all sides and curves that constitute said shape in the same units, then add all measurements together.
 
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