求一道初一关于三角形内角和的数学题在△ABC中,∠ACB=90°∠A=20°,将△ABC绕C点按逆时针方向旋转角α到△A"B"C"的位置,其中A"B"分别是A B 的对应点,B在A"B"上,CA "交AB于D,则∠BDC的度数为------?请自
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![求一道初一关于三角形内角和的数学题在△ABC中,∠ACB=90°∠A=20°,将△ABC绕C点按逆时针方向旋转角α到△A](/uploads/image/z/5855430-30-0.jpg?t=%E6%B1%82%E4%B8%80%E9%81%93%E5%88%9D%E4%B8%80%E5%85%B3%E4%BA%8E%E4%B8%89%E8%A7%92%E5%BD%A2%E5%86%85%E8%A7%92%E5%92%8C%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0ACB%3D90%C2%B0%E2%88%A0A%3D20%C2%B0%2C%E5%B0%86%E2%96%B3ABC%E7%BB%95C%E7%82%B9%E6%8C%89%E9%80%86%E6%97%B6%E9%92%88%E6%96%B9%E5%90%91%E6%97%8B%E8%BD%AC%E8%A7%92%CE%B1%E5%88%B0%E2%96%B3A%22B%22C%22%E7%9A%84%E4%BD%8D%E7%BD%AE%2C%E5%85%B6%E4%B8%ADA%22B%22%E5%88%86%E5%88%AB%E6%98%AFA+B+%E7%9A%84%E5%AF%B9%E5%BA%94%E7%82%B9%2CB%E5%9C%A8A%22B%22%E4%B8%8A%2CCA+%22%E4%BA%A4AB%E4%BA%8ED%2C%E5%88%99%E2%88%A0BDC%E7%9A%84%E5%BA%A6%E6%95%B0%E4%B8%BA------%3F%E8%AF%B7%E8%87%AA)
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