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dodge_viper 2017-6-23 09:58 PM

Equation of circle

請問b(iii)點做?我諗唔到佢點樣同前面計到果兩條equations有關

Aquarius_roy 2017-6-25 03:43 PM

After you get two equations, you can find the coordinate of point A and can show that those lines are perpendicular.
Then you can directly calculate two products OA X AB  and DA X AE

[[i] 本帖最後由 Aquarius_roy 於 2017-6-25 03:51 PM 編輯 [/i]]

mathtsang 2017-6-26 10:34 AM

Actually, it is very simple. Dont know why the question guide one to solve it by Co-geom.
Just prove that AEB ~ AOD, then the result will follows.
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查看完整版本: Equation of circle