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让= 3,BC = 4,△十二月∽△CDB,∴：DC = DC：BC,DC 2 = DE * BC = 12
BC = 4,∴BD = 2
△AED ∽△ACB∴广告：AB = DE：BC = 3:4,∴广告：BD = 3:1∵BD = 2∴AD = 6
∴罪∠A = DE：DA = 3时06分= 1 ：2,∴∠A = 30°
BC = 4,∴BD = 2
△AED ∽△ACB∴广告：AB = DE：BC = 3:4,∴广告：BD = 3:1∵BD = 2∴AD = 6
∴罪∠A = DE：DA = 3时06分= 1 ：2,∴∠A = 30°
1年前
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