sin법칙에의하면,a/sinA=b/sinB=c/sinC=2R일때를대입해보면,(a²/2R)+(b²/2R)=(C²/2R)이므로,각C가직각인직각삼각형이나옵니다./참고:b=2acosC일땐,a=c인이등변Δ
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