Math question: Calculate the area of a triangle with sides measuring 5 cm, 12 cm, and 13 cm using Heron's formula.
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What is the length of the base of a triangle with an area of 45 square units if its height is 9 units?
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Question: In a right triangle, if one of the acute angles measures 30 degrees and the hypotenuse has a length of 5 units, what is the length of the side opposite the 30-degree angle?