oier_forever的博客

题面 Labyrinth Time Limit: 2000MS Memory Limit: 32768K Total Submissions: 4997 Accepted: 1861 Description The northern part of the Pyramid contains a very large and complicated labyrinth. ...

题面 传送门 分析 如图:已知AB=L,弧AB=L(1+nC)AB=L,弧AB=L(1+nC)AB=L,弧AB=L(1+nC),M为AB中点,N为圆上一点,且ON垂直于AB于M,求MN 设半径为RRR,∠AOM=θ∠AOM=θ∠AOM=\theta(弧度),MN=xMN=xMN=x 则可列出方程组 ⎧⎩⎨⎪⎪⎪⎪2Rθ=L(1+nc)(1)Rsinθ=L2(2)x=R(1−cosθ...