F.5 Maths Circle

YTC

2014-12-16 8:17 am

1. Picture: http://postimg.org/image/g0yg26i2r/
In the figure, AOC and BOD are straight lines. Determine whether AB is the
tangent to another circle passing through points A, O and D at A.

2. Picture: http://postimg.org/image/5pm39iqdf/
In the figure, AQ is the tangent to the circle at Q. PR and OQ intersect at M such
that M is the mid-point of PR. If angle APM=2 x angle QRM, is it true that AP=AQ?
Explain your answer.

Please help, thank you~

回答 (1)

YA HOO！知識＋管理員

2014-12-17 1:32 am

✔ 最佳答案

Please Read：

圖片參考：https://s.yimg.com/rk/HA07344914/o/1616723311.png

2014-12-16 22:59:16 補充：
係，題目比嘅資料應該係搵唔到x係幾多。

就好似第1題only比左AOC and BOD are straight lines，

但無比到AOC同BOD系圓形嘅邊個位置到。

如果BOD轉1轉 ( 但O唔會移動，只係BD移動 )，

咁AB同AD嘅位置亦都唔同左，

但即使佢地移左位，

佢地都仲係符合題目所比嘅資料。

因為BOD移左位，但BOD同AOC都仲係 straight lines，

咁x就會變。

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