Ernest built an access ramp to his house it has a horizontal length of 8 feet, a the vertical height of 3.9 feet and the length of the ramp is 8.9 feet is this statement true or false

We can model the problem as a rectangle triangle.
 We know two sides.
 We want to find the hypotenuse.
 Using the Pythagorean theorem we have:
 h = root ((8) ^ 2 + (3.9) ^ 2)
 h = 8.9 feet
 
 this statement is true:
 The length of the ramp is 8.9 feet

Where’s the problems ? ?