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If the sides of a triangle are 13 cm, 14 cm, and 15 cm, what is its area?

A. 84 cm²

B. 90 cm²

C. 70 cm²

D. 105 cm²

Explanation: Using Heron’s formula with semi-perimeter s = (13+14+15)/2 = 21, Area = √(s(s-a)(s-b)(s-c)) = 84 cm².