~~你题干呢~~
by LiangYi200000000 @ 2024-03-27 17:34:14
@精神小伙！左边的那条线是垂直于地面吗
by f_hxr_ @ 2024-03-27 17:34:23
你知道 theta 和 l 就可以知道下面那段的长啊，然后勾股定理勾出来
by lonely_seele @ 2024-03-27 17:36:47
@[精神小伙！](/user/304211) 应该是$l \sin \theta \tan \frac{\theta}{2}$
by f_hxr_ @ 2024-03-27 17:39:16
~~如果$\theta$是锐角且我没推错的话，应该是对的~~
by f_hxr_ @ 2024-03-27 17:40:37
srds，我想到一个很抽象的东西 $l(1-\sin \theta)$
by FreedomKing @ 2024-03-27 17:55:30
@f_hxr_是
by 精神小伙！ @ 2024-03-27 18:06:54
@[精神小伙！](/user/304211) $l(1-\cos \theta)$ 应该也对吧
刚才若至搞错了/qd
by FreedomKing @ 2024-03-27 18:30:41
@[FreedomKing](/user/531806) 这是咋推的/yun
by 精神小伙！ @ 2024-03-27 18:47:40
感谢各位，会做了/bx
by 精神小伙！ @ 2024-03-27 18:48:57