Objective: I know how to use the Pythagorean theorem to determine whether a given triangle is a right triangle.

We can use the Pythagorean theorem to check whether a given triangle is a right triangle.

For a triangle with sides *a*, *b* and *c* and *c* is the longest side, if *c*^{2} = *a*^{2} + *b*^{2} then it is a right triangle.

Read the lesson on the Converse of the Pythagorean theorem for more information and examples.

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