圆外接三角形ABC中,AB=BC=CA,OD,OE为圆O的半径,∠DOE=120°.证;当∠DOE绕着O点旋转时,由两条半径和三形的两条边围成的图形面积始终是三角形ABC面积的三分之一
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![圆外接三角形ABC中,AB=BC=CA,OD,OE为圆O的半径,∠DOE=120°.证;当∠DOE绕着O点旋转时,由两条半径和三形的两条边围成的图形面积始终是三角形ABC面积的三分之一](/uploads/image/z/5203432-64-2.jpg?t=%E5%9C%86%E5%A4%96%E6%8E%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAB%3DBC%3DCA%2COD%2COE%E4%B8%BA%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%2C%E2%88%A0DOE%3D120%C2%B0.%E8%AF%81%EF%BC%9B%E5%BD%93%E2%88%A0DOE%E7%BB%95%E7%9D%80O%E7%82%B9%E6%97%8B%E8%BD%AC%E6%97%B6%2C%E7%94%B1%E4%B8%A4%E6%9D%A1%E5%8D%8A%E5%BE%84%E5%92%8C%E4%B8%89%E5%BD%A2%E7%9A%84%E4%B8%A4%E6%9D%A1%E8%BE%B9%E5%9B%B4%E6%88%90%E7%9A%84%E5%9B%BE%E5%BD%A2%E9%9D%A2%E7%A7%AF%E5%A7%8B%E7%BB%88%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E9%9D%A2%E7%A7%AF%E7%9A%84%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80)
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