回复：回复：回复：回复：回复：not right

You turn only 210 degree (60 + 90 + 60), then walk along the tangent line at that point for 10 units. If you turn 240 degree, you would be at the exact east side of your original position (the center of the circle). That's not necessary.

所有跟帖： 

• right -旗鼓相当- ♀ (318 bytes) () 01/25/2005 postreply 17:07:17

• 回复：回复：回复：回复：回复：回复：You re right -jinjing- ♀ (15 bytes) () 01/25/2005 postreply 19:09:38