已知△ABC中,AB=AC,∠B=56°24′,BC=6.36.求:AB的长,S△ABC

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已知△ABC中,AB=AC,∠B=56°24′,BC=6.36.求:AB的长,S△ABC已知△ABC中,AB=AC,∠B=56°24′,BC=6.36.求:AB的长,S△ABC已知△ABC中,AB=A

已知△ABC中,AB=AC,∠B=56°24′,BC=6.36.求:AB的长,S△ABC
已知△ABC中,AB=AC,∠B=56°24′,BC=6.36.求:AB的长,S△ABC

已知△ABC中,AB=AC,∠B=56°24′,BC=6.36.求:AB的长,S△ABC
cos∠B=cos56°24′=cos56.4=0.5539
cos∠B=BD/AB=3.18/AB=0.5539
所以AB=5.74
同理cot∠B=BD/AD
可得AD以及S△ABC