To start off with, I would draw a dotted line to form a rectangle and a square. Then you find the area of the square and the rectangle, and you and them together. Remember area is length times width.
Another way to solve this is draw a line from the 9 long side up and from the 6 long side out. This creates a full rectangle with out any where shapes. Find the area of the rectangle you created by drawing the lines, and subtract it from the area of the whole rectangle.
HOPE THIS HELPS!