A ladder 25 feet long is placed against the side of a building in such a way that it forms a 60 degree angle with the ground. The top of the ladder will touch the building___ feet from the ground.
This is a 30-60-90 right triangle in which the LONGER LEG is sought and with the hypotenuse's length (H) known, will be
That's IT!
No need to make this any more complex that it actually is!