In △ ABC ∠C = 90∘. Which side is the hypotenuse?

In triangle ABC, angle C is 90 degrees. Therefore, triangle ABC is right-angled.

By definition, the hypotenuse is the side of a right triangle opposite the right angle. Sides AC and BC are adjacent to corner C. Side AB lies opposite right angle C. Therefore, AB is the hypotenuse in right-angled triangle ABC with right angle C (by definition of the hypotenuse).

Answer: AB.

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