A 10-m ladder is leaning against a building The bottom of the ladder is 5 m from the building. how high is the top of the ladder?

Its pythagoras: 102 - 52 = vertical height2. So 100-25 = vertical height2. Then the square root of 75 must = vertical height. Which makes the top of the ladder 8.66 feet (8ft 8 inches) from the ground.