| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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A and C lie on a circle center O with radius √50. The point B inside the circle is such that ∠ABC = 90o, AB = 6, BC = 2. Find OB.
um.. i had to use calculator to do it, but since the number turns out to be so perfect, I wonder whether there's a smart way to this problem > <
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