请教,找不到一个公式了:

in equilateral triangle DEF,if DE=6,can i have the value of the alititude?
i cannot remember the formula now.
thanks,

所有跟帖： 

• Find a middle school Geometry text book, and read it! -念亲- ♀ (0 bytes) () 12/14/2009 postreply 14:50:37

• altitude h = DE sin 60 = sqrt(3)/2 * DE -任我为- ♂ (76 bytes) () 12/14/2009 postreply 15:20:26

• 谢谢任教授没笑话我...上几年班以后把这些知识都全部还给老师了,汗颜! -陶陶乐，乐陶陶- ♀ (20 bytes) () 12/14/2009 postreply 16:35:51

• Why didn't thank me?!!! -念亲- ♀ (208 bytes) () 12/14/2009 postreply 18:53:13

• 回复：Why didn't thank me?!!! -陶陶乐，乐陶陶- ♀ (93 bytes) () 12/14/2009 postreply 21:34:40

• 回复：回复：Why didn't thank me?!!! -陶陶乐，乐陶陶- ♀ (49 bytes) () 12/14/2009 postreply 22:11:19