如图一所示,在等腰直角三角形中,p是斜边bc的中点,以p为顶点的直角的两边分别与边ab,ac交于点e,f,当角epf绕顶点p旋转式(点e不与a,b重合),三角形pef也始终是等腰直角三角形,请你说明理由.如
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![如图一所示,在等腰直角三角形中,p是斜边bc的中点,以p为顶点的直角的两边分别与边ab,ac交于点e,f,当角epf绕顶点p旋转式(点e不与a,b重合),三角形pef也始终是等腰直角三角形,请你说明理由.如](/uploads/image/z/5190926-14-6.jpg?t=%E5%A6%82%E5%9B%BE%E4%B8%80%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E7%AD%89%E8%85%B0%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%AD%2Cp%E6%98%AF%E6%96%9C%E8%BE%B9bc%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E4%BB%A5p%E4%B8%BA%E9%A1%B6%E7%82%B9%E7%9A%84%E7%9B%B4%E8%A7%92%E7%9A%84%E4%B8%A4%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%8E%E8%BE%B9ab%2Cac%E4%BA%A4%E4%BA%8E%E7%82%B9e%2Cf%2C%E5%BD%93%E8%A7%92epf%E7%BB%95%E9%A1%B6%E7%82%B9p%E6%97%8B%E8%BD%AC%E5%BC%8F%EF%BC%88%E7%82%B9e%E4%B8%8D%E4%B8%8Ea%2Cb%E9%87%8D%E5%90%88%EF%BC%89%2C%E4%B8%89%E8%A7%92%E5%BD%A2pef%E4%B9%9F%E5%A7%8B%E7%BB%88%E6%98%AF%E7%AD%89%E8%85%B0%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E8%AF%B7%E4%BD%A0%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1.%E5%A6%82)
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