Ответ:
sin<CAB=CB/AB=3/5
sin^2<CAB+cos^2<CAB=1
cos<CAB=√(1-9/25)=√16/25=4/5=AC/AB
AB=AC/cos<CAB=k:4/5=5k/4
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Ответ:
sin<CAB=CB/AB=3/5
sin^2<CAB+cos^2<CAB=1
cos<CAB=√(1-9/25)=√16/25=4/5=AC/AB
AB=AC/cos<CAB=k:4/5=5k/4