Sheila is building an addition to a house. The points E (-1 1/2, -2 1/2), F (4 1/2, -2 1/2), G (4 1/2, -2 1/2), and H (-1 1/2, 3 1/2) are the points she plotted on a coordinate plane to draw the room plan. What is the shape of the addition to the house? What is the perimeter in units? This is a 6th grade problem for my little sister. I don’t know perimeter and area well. Plz help!!!