∴∠BAC=∠BDC-∠B-∠C=135°-30°-30°=75°.故答案为:75;(2)连接BC,∵∠A=60°,∴∠ABC+∠ACB=180°-60°=120°,∵∠BDC=140°,∴∠DBC+∠DCB=180°-140°=40°,∴∠ABD+∠ACD=120°-40°=80°,∵∠ABD与∠ACD的角平分线交于点E,∴∠EBD+∠ECD= 1 2×80°=40°,∴∠EBC+∠ECB...
There are concerns about the whereabouts of 135 Bureau De Change (BDC) operators arrested by the federal government over their alleged involvement in terrorism financing, after 11 months in detention. Intelligence agencies, police, and military sources have denied knowledge of where they are...
设每个正方形网格的边长为λ,由勾股定理得:AB2=2λ2,BD2=4λ2+λ2,DC2=9λ2+λ2,∴AB=2λ,BD=5λ,DC=10λ,而BC=5,∴DCAB=BCBD=BDAD=5,∴△BDC∽△DAB,∴∠BDC=∠BAD,而∠BAD=180°-45°=135°,∴∠BDC=135°. 点评:该题主要考查了相似三角形的判定及其性质定理的应用问题;解题的关键是...
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