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 No trigonometry, no algebra (Posted on 2005-12-23)
Look at the drawing below, where AB = BC = CD = DT = h, and TD perpendicular to AD:
```
o T
|
| (h)
|
|
+----------+----------+----------o
A    (h)   B    (h)   C    (h)   D```
The line AT makes an angle x with AD; the line BT makes an angle y with BD; the line CT makes an angle z with CD.

Using only geometry, prove that (angle x) + (angle y) = (angle z).

 See The Solution Submitted by pcbouhid Rating: 3.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
 Subject Author Date re(2): Complex solution goFish 2005-12-24 15:16:53 re: Complex solution MindRod 2005-12-24 12:29:24 re: Solution MindRod 2005-12-24 12:20:19 Complex solution goFish 2005-12-24 04:44:58 Solution Bractals 2005-12-24 04:35:23 With Trig. Identity Bractals 2005-12-24 03:41:34 a start, maybe MindRod 2005-12-23 22:24:58 re(2): only geometry? pcbouhid 2005-12-23 15:09:48 re: only geometry? Richard 2005-12-23 13:47:41 only geometry? MindRod 2005-12-23 12:51:35
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