如图,AB∥CD,AC⊥BC,∠ABC=35°,则∠1的度数为.

如图,AB∥CD,AC⊥BC,∠ABC=35°,则∠1的度数为      

 

答案

55° 

【考点】平行线的性质;垂线.

【分析】首先根据平行线的性质可得∠ABC=∠BCD=35°,再根据垂线的定义可得∠ACB=90°,再利用平角的定义计算出∠1的度数.

【解答】解:∵AB∥CD,

∴∠ABC=∠BCD=35°,

∵AC⊥BC,

∴∠ACB=90°,

∴∠1=180°﹣90°﹣35°=55°,

故答案为:55°.

【点评】此题主要考查了平行线的性质,关键是掌握两直线平行,内错角相等.

 

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