Which best explains whether a triangle with side lengths 5 cm, 13 cm, and 12 cm is a right triangle?

The Pythagorean theorem says a triangle is a right triangle if the squares of its two shorter sides add to the square of its longest side. Here, 5² + 12² = 25 + 144 = 169, and 13² = 169. Therefore, the triangle is a right triangle, as choice B states.

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