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2014-04-22T19:01:40+03:00
Sin B/cosB=3/4, AC/AB=3/4 AC=3/4AB,900=AB²+9/16AB²,AB=24, AC=3/4*24=18 cm
P=30+24+18=72 cm
sin B=18/30=3/5
COS B=24/30=4/5
CTG B=cos B/sin B=4/3
sin C=4/5, cos C=3/5,tg C=4/3, ctg C=3/4
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