posted by david on .
A ladder resting against the side of a building reaches 32 ft up the building. If the ladder is 40 ft long, how far from the building is the base of the ladder?
Draw the problem out, with a ladder leaning against the wall, and label the respective lengths. You will notice it forms a right-angle triangle, with the ladder as the hypotenuse.
So the theorem is
where c represents the ladder length (the hypotenuse), and so a can represent the distance of the ladder from the base of the building (the answer), and b is where the ladder reaches on the building.
Since a is what we need, rearrange the above formula to solve for a and you will get your answer. (Remember the units ft)
The doorway of the family room measures 6 1/2 feet by 3 feet. What is the length of the diagonal of the doorway?