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.