Question 276441
A 20-ft ladder is leaning against a building. If the bottom of the ladder is 12 ft from the base of the building, how high does the ladder reach?


Ladder length = 20 ft.

distance from base = 12 feet.

Using the pythagoras theorem

20^-12^2= height^2

400-144=256

= 16^2

So height = 16 feet.