抛物线y=(x-3)²的顶点为C,与y轴交于点A.(1)设△AOC的内心为I,求IC的长(2)设点A关于X轴的对称点A′,直线A′C叫抛物线于点B,求S△OBC.
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![抛物线y=(x-3)²的顶点为C,与y轴交于点A.(1)设△AOC的内心为I,求IC的长(2)设点A关于X轴的对称点A′,直线A′C叫抛物线于点B,求S△OBC.](/uploads/image/z/2576219-59-9.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D%28x-3%29%26%23178%3B%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAC%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9A.%EF%BC%881%EF%BC%89%E8%AE%BE%E2%96%B3AOC%E7%9A%84%E5%86%85%E5%BF%83%E4%B8%BAI%2C%E6%B1%82IC%E7%9A%84%E9%95%BF%EF%BC%882%EF%BC%89%E8%AE%BE%E7%82%B9A%E5%85%B3%E4%BA%8EX%E8%BD%B4%E7%9A%84%E5%AF%B9%E7%A7%B0%E7%82%B9A%E2%80%B2%2C%E7%9B%B4%E7%BA%BFA%E2%80%B2C%E5%8F%AB%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%BA%8E%E7%82%B9B%2C%E6%B1%82S%E2%96%B3OBC.)
抛物线y=(x-3)²的顶点为C,与y轴交于点A.(1)设△AOC的内心为I,求IC的长(2)设点A关于X轴的对称点A′,直线A′C叫抛物线于点B,求S△OBC.
抛物线y=(x-3)²的顶点为C,与y轴交于点A.
(1)设△AOC的内心为I,求IC的长
(2)设点A关于X轴的对称点A′,直线A′C叫抛物线于点B,求S△OBC.
抛物线y=(x-3)²的顶点为C,与y轴交于点A.(1)设△AOC的内心为I,求IC的长(2)设点A关于X轴的对称点A′,直线A′C叫抛物线于点B,求S△OBC.
如图所示:S△OBC.=13.5 IC的长=2.149