∫∠DAB = 60, AC equal division ∠DAB,
∴∠DAC=∠BAC=30。
∵BC⊥AC，
∴∠AFD=∠ACB=90。
∴DF= 12AD= 12×6=3，
BC=CE？ Tan ∠BEC=473×733=4.
∴ef=dftan∠def=dftan∠bec=3÷733=373.AC=BCtan∠BAC=4tan30 =4÷33=43。
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