If you multiply 7 by .75 you get 5.25 rectangle = area = 5.25 then multiply 2.5 by itself and you get 6.25 square area = 6.25 So the 2 1/2 inch square has more room
Act like the two triangles are one and to find z and find the others find z first comment if you didn’t understand and I will go into it with more detail