# Find the Square or Rectangle Perimeter (2,1) , (2,3) , (5,1)

, ,
The distances between the given points are the length (l), width (w), and diagonal (d).
The distance between the three corners is:
and
and
and
The diagonal is the longest distance and the width is the shortest distance, which means and .
The perimeter of a rectangle is .
In this case, the perimeter is . Add the length and the width of the rectangle then multiply the answer by .
Remove parentheses.
Simplify .