已知一副三角板ABE与ACD1)将两个三角板如图(5)放置,连结BD计算∠1+∠2=?2)将图(5)中的三角板BAE绕点A顺时针旋转一个锐角a①当 a=——时,AB//CD如图(6)并计算 a+∠1+∠2=?②当 a =40° 时,如图(
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![已知一副三角板ABE与ACD1)将两个三角板如图(5)放置,连结BD计算∠1+∠2=?2)将图(5)中的三角板BAE绕点A顺时针旋转一个锐角a①当 a=——时,AB//CD如图(6)并计算 a+∠1+∠2=?②当 a =40° 时,如图(](/uploads/image/z/8746572-12-2.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%80%E5%89%AF%E4%B8%89%E8%A7%92%E6%9D%BFABE%E4%B8%8EACD1%29%E5%B0%86%E4%B8%A4%E4%B8%AA%E4%B8%89%E8%A7%92%E6%9D%BF%E5%A6%82%E5%9B%BE%285%29%E6%94%BE%E7%BD%AE%2C%E8%BF%9E%E7%BB%93BD%E8%AE%A1%E7%AE%97%E2%88%A01%2B%E2%88%A02%3D%3F2%EF%BC%89%E5%B0%86%E5%9B%BE%EF%BC%885%EF%BC%89%E4%B8%AD%E7%9A%84%E4%B8%89%E8%A7%92%E6%9D%BFBAE%E7%BB%95%E7%82%B9A%E9%A1%BA%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC%E4%B8%80%E4%B8%AA%E9%94%90%E8%A7%92a%E2%91%A0%E5%BD%93+a%3D%E2%80%94%E2%80%94%E6%97%B6%2CAB%2F%2FCD%E5%A6%82%E5%9B%BE%EF%BC%886%EF%BC%89%E5%B9%B6%E8%AE%A1%E7%AE%97+a%2B%E2%88%A01%2B%E2%88%A02%3D%3F%E2%91%A1%E5%BD%93+a+%3D40%C2%B0+%E6%97%B6%2C%E5%A6%82%E5%9B%BE%EF%BC%88)
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