已知圆C同时满足下列三个条件:①与y轴相切;②在直线y=x上截得弦长.我想知道为什么R=3|a|?已知圆C同时满足下列三个条件:①与y轴相切;②在直线y=x上截得弦长为2根号7 ;③圆心在直线x-3y=0上.求
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![已知圆C同时满足下列三个条件:①与y轴相切;②在直线y=x上截得弦长.我想知道为什么R=3|a|?已知圆C同时满足下列三个条件:①与y轴相切;②在直线y=x上截得弦长为2根号7 ;③圆心在直线x-3y=0上.求](/uploads/image/z/3963499-43-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86C%E5%90%8C%E6%97%B6%E6%BB%A1%E8%B6%B3%E4%B8%8B%E5%88%97%E4%B8%89%E4%B8%AA%E6%9D%A1%E4%BB%B6%3A%E2%91%A0%E4%B8%8Ey%E8%BD%B4%E7%9B%B8%E5%88%87%3B%E2%91%A1%E5%9C%A8%E7%9B%B4%E7%BA%BFy%3Dx%E4%B8%8A%E6%88%AA%E5%BE%97%E5%BC%A6%E9%95%BF.%E6%88%91%E6%83%B3%E7%9F%A5%E9%81%93%E4%B8%BA%E4%BB%80%E4%B9%88R%3D3%7Ca%7C%3F%E5%B7%B2%E7%9F%A5%E5%9C%86C%E5%90%8C%E6%97%B6%E6%BB%A1%E8%B6%B3%E4%B8%8B%E5%88%97%E4%B8%89%E4%B8%AA%E6%9D%A1%E4%BB%B6%3A%E2%91%A0%E4%B8%8Ey%E8%BD%B4%E7%9B%B8%E5%88%87%3B%E2%91%A1%E5%9C%A8%E7%9B%B4%E7%BA%BFy%3Dx%E4%B8%8A%E6%88%AA%E5%BE%97%E5%BC%A6%E9%95%BF%E4%B8%BA2%E6%A0%B9%E5%8F%B77+%3B%E2%91%A2%E5%9C%86%E5%BF%83%E5%9C%A8%E7%9B%B4%E7%BA%BFx-3y%3D0%E4%B8%8A.%E6%B1%82)
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