题目内容
(12分)如图①②所示,将两个相同三角板的两个直角顶点O重合在一起,像图①②那样放置。
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① ②
(1)若∠BOC=60°,如图①,猜想∠AOD的度数。
(2)若∠BOC=70°,如图②,猜想∠AOD的度数。
(3)猜想∠AOD和∠BOC的关系,并写出理由。
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① ②
(1)若∠BOC=60°,如图①,猜想∠AOD的度数。
(2)若∠BOC=70°,如图②,猜想∠AOD的度数。
(3)猜想∠AOD和∠BOC的关系,并写出理由。
(1)
(2)
(3)
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试题分析:(1)因为
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(2)因为
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(3)由(1)知
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点评:本题难度不大,关键在于两个三角形是全等的,所以各组角对应相等
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