弓高51厘米，弦长1.1米，半径应该是多少？弧长多长？
\u5f13\u9ad851\u6beb\u7c73\u5f26\u957f210\u4eb3\u7c73\u7684\u534a\u5f84\u662f\u591a\u5c11\u534a\u5f84\u7684\u5e73\u65b9-\uff08\u534a\u5f84-\u62f1\u9ad8\uff09\u7684\u5e73\u65b9\uff1d\u5f26\u957f\u4e00\u534a\u7684\u5e73\u65b9
R²\uff1d105²\uff0b\uff08R\uff0d51\uff09²
\u89e3\uff1a
102R\uff1d11025\uff0b2601\uff1d13626
R\uff1d133.588
\u534a\u5f84\u662f133.588\u4eb3\u7c73\u3002
弧所对的圆心角为A。
R^2=(R-H)^2+(L/2)^2
R^2=R^2-2*R*H+H^2+L^2/4
2*R*H=H^2+L^2/4
R=H/2+L^2/(8*H)
=0.51/2+1.1^2/(8*0.51)
=0.5516米
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((1.1/2)/0.5516)
=171.356度
C=π*R*A/180=π*0.5516*171.356/180=1.6496米
那个所谓的弓高是横着放还是竖着放
这个要算，不难
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