In the figure below, ABDC, EFHG, and ASHY are all squares; and AB = EF = 1 and AY = 6. What is the area of quadrilateral DYES?
The area of the total region is 6 x 6 = 36.
The area of the 2 squares is 1 + 1 = 2.
The area of the triangle outside of DYES but inside the big square is 2.5 ((5 x 1) /2)
There are 4 of these, so the total area of the triangles is 10.
Can you tell me the area now?