To determine the perimeter of the polygon, we must find the sum of its side lengths. This polygon has four vertices, so it's a quadrilateral. Let's draw it in a coordinate plane.
We can see that the given figure is a rectangle. Therefore, its perimeter can be expressed as shown below.
P=2l +2wIn this formula l is the length of the longer side of the rectangle and w is the length of the shorter side of the rectangle. In our case l=GH=KJ and w=KG=JH.
P=2GH+2KG
This means that we only have to find GH and KG. We can use the Ruler Postulate to do this. Let's start with GH.
