+1859 The rectangle below has been divided into unit squares. Find the total area of the blue shaded region, in square units.
+394 By pythagorean theorem looking at a right triangle with the hypotenuse of the side length of the square,
\({2}^{2}+{4}^{2}={c}^{2}\). c2 is also the area of the square, so our area is 22+42=20.
