в прямоугольном треугольнике abc угол b=90, гипотенуза ab=55, cosB=0,8 найдите ca
SinB=√1-Cos²B=√1-0.8²=√1-0.64=√0.36=0.6
SibB=AC/AB ⇒ AC=AB*SinB=55*0.6=33
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SinB=√1-Cos²B=√1-0.8²=√1-0.64=√0.36=0.6
SibB=AC/AB ⇒ AC=AB*SinB=55*0.6=33