Find the area of a triangle whose sides measure 13 cm, 14 cm, and 15 cm.

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• A 84 cm²
• B 42 cm²
• C 168 cm²
• D 90 cm²

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Answer: A. 84 cm²

s = (13 + 14 + 15)/2 = 21 cm.
Area = √(21 × 8 × 7 × 6) = √7056 = 84 cm².

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