有没有好办法？

A beam of light strikes  at point  with angle of incidence  and reflects with an equal angle of reflection as shown. The light beam continues its path, reflecting off line segments  and  according to the rule: angle of incidence equals angle of reflection. Given that  and  determine the number of times the light beam will bounce off the two line segments. Include the first reflection at  in your count.

所有跟帖： 

• 38次？ -exe- ♂ (17 bytes) () 01/01/2012 postreply 13:05:10

• 1 time deal... or... 70 times? -花心鬼- ♂ (481 bytes) () 01/01/2012 postreply 14:40:53

• your method only in special case can be OK. -jinjing- ♀ (192 bytes) () 01/01/2012 postreply 17:39:52

• If it is from Ps Q, We can do like that -jinjing- ♀ (309 bytes) () 01/02/2012 postreply 11:12:38

• 回复：If it is from Ps Q, We can do like that -cma- ♂ (7782 bytes) () 01/02/2012 postreply 13:48:33

• dear cma,81is not good. -jinjing- ♀ (266 bytes) () 01/02/2012 postreply 16:54:15

• I try by strict Math, the anwser should be between 78 and 81 -jinjing- ♀ (155 bytes) () 01/03/2012 postreply 12:09:54