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歡迎您訪問數學考題練習:如圖,四邊形ABCD是平行四邊形,∠D=120!

數學考題練習:如圖,四邊形ABCD是平行四邊形,∠D=120

更新時間:2024-01-12 16:47:57作者:貝語網校

如圖,四邊形ABCD是平行四邊形,∠D=120°,∠CAD=32°,則∠ABC、∠CAB的度數分別為

A.28°,120°

B.120°,28°

C.32°,120°

D.120°,32°

試題答案

B

試題解析

由四邊形ABCD是平行四邊形,易得∠B=∠D,∠BAD+∠D=180°.即可求得∠ABC、∠CAB的度數.

解答:∵四邊形ABCD是平行四邊形,

∴∠B=∠D,AB∥CD,

∴∠BAD+∠D=180°,

∵∠D=120°,∠CAD=32°,

∴∠ABC=∠D=120°,∠BAD=60°,

∴∠CAB=∠BAD-∠CAD=60°-32°=28°.

故選B.

點評:此題考查了平行四邊形的性質:平行四邊形的對邊平行,對角相等,熟記性質是解題的關鍵.

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