In order to find the perimeter, you need to know the lengths of all
Draw a triangle so that the missing side is the hypotenuse of the triangle. Then use the Pythagorean Theorem to find the length of the hypotenuse.
Now add all the sides together to get the perimeter of the parallelogram.
Does the answer for the perimeter repeat or terminate?
Use the eTool below to graph the points and create a parallelogram.
Click the link at right for the full version of the eTool: 10-105 HW eTool