Chris works in a tall building in downtown Columbia. We are going to view this
skyscraper as a line segment. The building has
an endpoint of point A at the top of the
building, and an endpoint C at the front
door. The building is 43 stories tall. So we
know that the length of AC = 43. Chris
works at point B on the building which is 12
stories above C. Find the length of AB.