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∵D是線段AB垂直平分線上的點,∴AD=BD,∴△DAB是等腰三角形,∠B=∠DAB,∵∠DAE與∠DAC的度數比為2:1,∴設∠DAC=x,則∠B=∠DAB=2x,∴x+2x+2x=90°,∴x=18°,即∠B=36°.
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