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).

(In reply to re: Complex solution by Mindrod)

Q What is next in the sequence? A, B, C, D, ...?

A T

Yes,  my Eee s should be Paulo's Tee s.

Santa, I urgently need those glasses now. See you in 3-4 hours!

Posted by goFish on 2005-12-24 15:16:53