51. The area of the rectangle is lw. The triangle's base and height are both w, so its area is 1/2 (w)^2. The total area will be lw + (1/2)w^2, which is choice A.
52. The best answer is G. This is a circle of diameter 10 in, so 10 in is the longest dimension, and you would not be able to cut a 2-in wide section that is 10 in long since the circle immediately gets smaller when you move away from the diameter.
