Posted by **Hannah** on Monday, March 26, 2012 at 2:05am.

Mark wanted to measure the height of a nearby building. He placed a mirror on the pavement at point P, 80 feet from the base of the building. He then backed away until he saw an image on the top of the building in the mirror. If Mark is 6 feet tall, and he is standing 9 feet from the mirror, how tall is the building?

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