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If we know the lengths of any two sides of a right triangle, we can find the length of the third side using the Pythagorean theorem.

The whole numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and so on. They are used to answer questions such as How many?, How fast?, and How far?

You can use integers to deal with negative numbers to describe situations like temperatures below 0, or a balance in a checking account that is overdrawn