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The perimeter is also twice as large.
Imagine an n-sided polygon with a side length of x, then perimeter = nx. If sides are reduced to x/2 the perimeter becomes nx/2, ie it is halved.
The sum of the lengths of the sides of a polygon is called the perimeter.
Add all sides together to get the perimeter.
add the sides toghther and then you'll have your perimeter of your triangle