cosC=(АС²+ВС²-АВ²)/(2АС·ВС), cosC=(72+64-232)/(2·6√2·8)=-√2/2, ∠С=135°
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cosC=(АС²+ВС²-АВ²)/(2АС·ВС), cosC=(72+64-232)/(2·6√2·8)=-√2/2, ∠С=135°