Matt is building a bird box from wood.
the side of the bird box is shown below.
the length of the base is 120 mm.
the height of the front is 150 mm.
the height of the back is 200 mm.

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)