There are 7 smaller squares inside the large rectangle above.
If the green square has side length 1 and the brown square has side length 2, what is the area of the rectangle?
One 1 x 1 square
Three 2 x 2 squares
One 3 x 3 square
One 4 x 4 square
One 5 x 5 square
1^2 + 3*2^2 + 3^2 + 4^2 + 5^2 =
1 + 12 + 9 + 16 + 25 =
63
