How Tall Is That Building?

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You can use similar triangles to find the height of a building. The shadows of a building and a person standing vertically create two black triangles. The corresponding sides are proportional. Therefore, you can find the height of the building by measuring the lengths of the two shadows and the height of the person.

Contributed by: Cassandra Irish (March 2011)
Open content licensed under CC BY-NC-SA


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