在三角形ABC中,a+b=1,A=60ºB=45º求边a和b
人气:235 ℃ 时间:2020-05-25 12:19:19
解答
根据正弦定理:a=2RsinA,b=2RsinB∵a+b=1,A=60º,B=45º∴2Rsin60º+2Rsin45º=1∴2R(√3/2+√2/2)=1∴2R=2(√3-√2)∴a=2Rsin60º=2(√3-√2)*√3/2=3-√6 b=1-a=√6-2
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