Answer: 31.5 feet
Explanation:
Using this information, we can create a right triangle, with the hypotenuse being 39 and the height/first leg being 23.
Then, we can use the pythagorean theorem to calculate the missing leg (distance at the bottom):
a² + b² = c²
23² + b² = 39²
529 + b² = 1521
b = ≈ 31.5