Scesz, this is the solution to the problem:
For finding the height where the top of the ladder is, we will use the Pythagorean Theorem, this way:
Hypotenuse = 11 ft
Leg 1 = 6 ft
Leg 2 = x
Therefore,
x² = 11² - 6²
x² = 121 - 36
x² = 85
Square root at both sides:
√x² = √85
x = 9.22
x = 9.2 (Rounding to the nearest tenth)
The top of the ladder will be 9.2 ft from the ground.