How long is the diagonal of a 12ft-by16-ft rectangular garden?

this is the pythagorean theorem: x^2 + y^2 = c^2.

1) 12^2 + 16^ = c^2

2) 144 + 256 = c^2

3) 400 = c^2

4) Take the sq. root of both sides.

5) 20 = c