If your looking for the perimeter the answer is 14.
Explanation;
⇒ Find the vertices on a coordinate plane and plot them to make whatever shape there is (rectangle).
⇒ When you are done, count, not the corners of the shape, but the sides. Once you have found it add them 5+5+2+2 to get 14. (Kind of like counting all four sides but doesn't include the edges). Work to find the area is below. (Using how I found the vertical distance and how I found the horizontal distance).
If you are looking for the area the answer is 18.
Explanation;
You find the distance between A and D to get the length.
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⇒ Since we are going vertical, we subtract the second slot in A and D |-2 minus 7| to get |5| and turn it into an absolute value which is 5. That is our length.
You can find the distance between D and C to get the width.
⇒ Since we are going horizontal, we subtract the first slot in D and C |-4 minus -2| to get |-2| and turn it into its absolute value which is 2.
Extra information;
⇒ First, since we are finding A we add |-4,-2| to get |-6| and find the absolute value which is 6.
⇒ Now, since we are finding B we add |-2,-2| to get |-4| and find the absolute value which is 4.
⇒ Next, since we are finding C we add |-2,7| to get |5| and find the absolute value which is 5.
⇒ Finally, since we are finding D we add |-4,7| to get |3| and find the absolute value which is 3.
Hope this helped you!