◑﹏◐ !数学一题!◑﹏◐如右图所示,三角形ABC中,AB=AC,CD为AB边上的高,说明:∠A=2∠BCD. (要详细过程~~!【有附图】)
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![◑﹏◐ !数学一题!◑﹏◐如右图所示,三角形ABC中,AB=AC,CD为AB边上的高,说明:∠A=2∠BCD. (要详细过程~~!【有附图】)](/uploads/image/z/14325939-27-9.jpg?t=%26%239681%3B%EF%B9%8F%26%239680%3B+%21%E6%95%B0%E5%AD%A6%E4%B8%80%E9%A2%98%21%26%239681%3B%EF%B9%8F%26%239680%3B%E5%A6%82%E5%8F%B3%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAB%3DAC%2CCD%E4%B8%BAAB%E8%BE%B9%E4%B8%8A%E7%9A%84%E9%AB%98%2C%E8%AF%B4%E6%98%8E%EF%BC%9A%E2%88%A0A%3D2%E2%88%A0BCD.++++%EF%BC%88%E8%A6%81%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B%7E%7E%21%E3%80%90%E6%9C%89%E9%99%84%E5%9B%BE%E3%80%91%EF%BC%89)
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◑﹏◐ !数学一题!◑﹏◐如右图所示,三角形ABC中,AB=AC,CD为AB边上的高,说明:∠A=2∠BCD. (要详细过程~~!【有附图】)
◑﹏◐ !数学一题!◑﹏◐
如右图所示,三角形ABC中,AB=AC,CD为AB边上的高,
说明:∠A=2∠BCD.
(要详细过程~~!【有附图】)
◑﹏◐ !数学一题!◑﹏◐如右图所示,三角形ABC中,AB=AC,CD为AB边上的高,说明:∠A=2∠BCD. (要详细过程~~!【有附图】)
∠A=180°-∠B-∠C=180°-2∠B
∠BCD=90°-∠B
所以∠A=2∠BCD