Use the Law of Cosines: \( c^2 = a^2 + b^2 - 2ab\cos C \), where \( a = 13 \), \( b = 15 \), \( C = 60^\circ \), \( \cos 60^\circ = 0.5 \).

Sat, 02 May 2026 19:38:49 +0000

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