Answer:
≈ 19.1 feet
Explanation:
A right triangle is formed by the building , the ground and the ladder , that is the hypotenuse.
let x be the distance foot of ladder is from the building.
using Pythagoras' identity in the right triangle
x² + 34² = 39²
x² + 1156 = 1521 ( subtract 1156 from both sides )
x² = 365 ( take square root of both sides )
x =
≈ 19.1 feet ( to the nearest tenth )