use this formula and answer A=L*H
18 square units.
graph the square or find the difference then multiply the base by the hight.
distance formula then find area
The area of the rectangle is D. 12 unit length
You can find this by plotting each of the points and drawing the triangle. You can then use the distance formula to determine each side length. The triangle will be on one side and on the other. When multiplied together, it will give you the above answer.
Hope this helps!