已知△ABC的周长为L,面积为S,其内切圆圆心为O,半径为r,求证r=2s/l!已知A(-3,0)B(3.0)c(0.4)若△ABC的内心为D,求点D坐标 3、与三角形一边和其他两边的延长线相切的圆叫旁切圆,圆心角旁
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![已知△ABC的周长为L,面积为S,其内切圆圆心为O,半径为r,求证r=2s/l!已知A(-3,0)B(3.0)c(0.4)若△ABC的内心为D,求点D坐标 3、与三角形一边和其他两边的延长线相切的圆叫旁切圆,圆心角旁](/uploads/image/z/4535674-34-4.jpg?t=%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BAL%2C%E9%9D%A2%E7%A7%AF%E4%B8%BAS%2C%E5%85%B6%E5%86%85%E5%88%87%E5%9C%86%E5%9C%86%E5%BF%83%E4%B8%BAO%2C%E5%8D%8A%E5%BE%84%E4%B8%BAr%2C%E6%B1%82%E8%AF%81r%3D2s%2Fl%21%E5%B7%B2%E7%9F%A5A%EF%BC%88-3%EF%BC%8C0%EF%BC%89B%EF%BC%883.0%EF%BC%89c%EF%BC%880.4%EF%BC%89%E8%8B%A5%E2%96%B3ABC%E7%9A%84%E5%86%85%E5%BF%83%E4%B8%BAD%EF%BC%8C%E6%B1%82%E7%82%B9D%E5%9D%90%E6%A0%87+3%E3%80%81%E4%B8%8E%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%80%E8%BE%B9%E5%92%8C%E5%85%B6%E4%BB%96%E4%B8%A4%E8%BE%B9%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E7%9B%B8%E5%88%87%E7%9A%84%E5%9C%86%E5%8F%AB%E6%97%81%E5%88%87%E5%9C%86%EF%BC%8C%E5%9C%86%E5%BF%83%E8%A7%92%E6%97%81)
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