∠A:∠B:∠C=1:2:3,则∠A=30°,∠B=60°,∠C=90°
根据正弦定理有
BC:sin∠A=AC:sin∠B=AB:sin∠C=2R
则
BC=R
AC=根号2乘以R
AB=根号3乘以R
所以AB:BC:AC=根号3：1：根号2
在三角形abc中,若角a:角b:角c=1:2:3,则ab:bc:ca=?
在三角形abc中,若角a:角b:角c=1:2:3,则ab:bc:ca=?
数学人气：164 ℃时间：2019-10-08 08:43:01
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