Observe the figure:

consider the rectangle.

Part A:

The area of the rectangular is .

Here rectangle breadth and length .

Find area of the rectangle.

              (Original equation)

     (Substitute and )

The area of the rectangular is .

Option (B) is right choice.

Part B: \ \

Consider the option A.

Option A:

.

Draw the rectangles: \ \

  \ \

Consider the option C.

Option C:

.

Draw the rectangles: \ \

Consider the option D.

Option D:

.

Option (B) is right choice.