已知玄长8.57弓高0.34求半径 已知弦长18400毫米，弓高1500毫米求半径
\u77e5\u9053\u7384\u957f \u5f13\u9ad8 \u6c42\u534a\u5f84\u8bbe\u5f13\u9ad8\u4e3aX\uff0c\u534a\u5f84\u4e3aR.\u5f26\u957fL,\u5219\u7531\u4e09\u89d2\u5b9a\u7406\u53ef\u5f97\uff08R-X)^2+(L/2)^2=R^2,\u89e3\u8fd9\u4e2a\u65b9\u7a0b\u4fbf\u53ef\u5f97\u534a\u5f84\uff01
h=R-\u221a(R^2-(L/2)^2)
h=1500
L=18400
\u4ee3\u5165\uff0c\u6c42\u89e3\uff0c\u5f97R=28.96\u7c73
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