The area of a right triangle is 30 cm^2. If the base is 5 cm, then the hypotenuse must be:

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• A 12 cm
• B 18 cm
• C 13 cm
• D 20 cm

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Answer: C. 13 cm

Area = 1/2 x base x height, so 30 = 1/2 x 5 x height, giving height = 12 cm.
Hypotenuse = sqrt(5² + 12²) = sqrt(169) = 13 cm.

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