The correct response is:
The length is 13 units because the hypotenuse is the longest side.
In a triangle, the hypotenuse is the longest side, which is opposite the right angle. Given the side lengths provided (approximately 6.1 units, 11.48 units, and 13 units), the side measuring 13 units is indeed the longest. From the context, since we know two angles (62 degrees and 28 degrees) and no right angle is mentioned, we can conclude that if it were a right triangle, the side opposite the right angle (hypotenuse) would be the longest side. Hence, the hypotenuse is confirmed to be 13 units.