ctk0907 發表於 9-4-2009 19:36:59

有一條數唔識做

鉛筆痕唔好理我fd畫的

§阿虛§ 發表於 10-4-2009 00:17:44

原來我同你用埋同一本書...
本書個 hints 俾左哩個圖....
佢寫住...

As shown in the figure, we can obtain y - x = -10 度 by using the fact that the sum of abjacent angles at a point is 360 度. Hence, we can find <AOB....

我諗睇完哩段野之後應該識做了...

L.K. 發表於 10-4-2009 00:49:23

um...
有冇學過INCENTRE?

§阿虛§ 發表於 10-4-2009 00:58:43

um...
有冇學過INCENTRE?
L.K. 發表於 10-4-2009 00:49 http://nakuz.com/bbs/images/common/back.gif

妙 ! 妙 ! 妙 ! 極快的方法 []

好精彩的 tangent properties..... [] (是 tangent properties 吧？ =.=)
incentre 有 properties 可以應用到0係哩題？ []
好想知啊 /口\

L.K. 發表於 10-4-2009 01:16:20

incentre都係用黎證兩個角相等..
同TANGENT PROPERTIES冇分別
http://en.wikipedia.org/wiki/Triangle

§阿虛§ 發表於 10-4-2009 01:24:19

咦 =.=
係喎 = =
個 incentre 係 angle bisector 0既交點黎 =.=

但係...quadrilateral 用到？只要係 inscribed, 唔係triangle 都得？

L.K. 發表於 10-4-2009 01:28:23

未一樣=.=''
廷長D線未三角形LOR

§阿虛§ 發表於 10-4-2009 01:31:18

係喎 =.=
咁都得 =.=
咁姐係哩樣野適用於任何 inscribed circle =0=

ctk0907 發表於 10-4-2009 13:04:42

原來我同你用埋同一本書...
本書個 hints 俾左哩個圖....
佢寫住...

As shown in the figure, we can obtain y - x = -10 度 by using the fact that the sum of abjacent angles at a point is 360 度. Hence, we...
§阿虛§ 發表於 10-4-2009 00:17 http://www.nakuz.com/bbs/images/common/back.gif
條數係我個fd比我計- -




um...
有冇學過INCENTRE?
L.K. 發表於 10-4-2009 00:49 http://www.nakuz.com/bbs/images/common/back.gif
有學過但唔記得左
介唔介意講述比我聽plz~

L.K. 發表於 10-4-2009 13:25:02

一個3角形..
3條角平分線相交果一點就係incentre
起3角形入面畫一個最大ge圓形
圓心=incentre
http://en.wikipedia.org/wiki/Triangle
呢到有齊哂..
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