Find "k" so that the 80 unit diagonal of a rectangle can have an aspect ratio of 4:3.
Then find the length and width of the
rectangle and find its area.

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm