Question

Brandon has an extension ladder that can only be used at a length of 10 feet, 15 feet, or 20 feet. He places the base of the latter 9 feet from the wall I need the top of the ladder to reach 12. Which ladder laying with Benton need to use to reach the height of the wall?

Answer 1

15

Explanation:

Use Pythagorean theorem.

c² = a² + b²

c² = 9² + 12²

c² = 225

c = 15