BC=5
CA=2
BA=4
BA²=CA²+BC²-2*CA*BC*cosC
16=2+25-2*2*5*cosa
16=27-20cosa
20cosa=27-16
20cosa=11
cosa=11/20=0,55
/_С=56,6°
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BC=5
CA=2
BA=4
BA²=CA²+BC²-2*CA*BC*cosC
16=2+25-2*2*5*cosa
16=27-20cosa
20cosa=27-16
20cosa=11
cosa=11/20=0,55
/_С=56,6°