垂径定理6内容摘要:
, AC BCAD BD即直径 CD平分弦 AB,并且平分 及 AB ACB垂直于弦的直径平分弦,并且平分弦所对的两条弧. 平分弦(不是直径)的直径垂直于弦,并且平分弦所对的两条弧. 这个定理也叫垂径定理,利用这个定理,你能平分一条弧吗。 解得: R≈27. 9( m) O D A B C R 解决求赵州桥拱半径的问题。 在 Rt△ OAD中,由勾股定理,得 即 R2=+( R- ) 2 因此,赵州桥的主桥拱半径约为 . OA2=AD2+OD2 , ABADAB=, CD=, OD=OC- CD=R- 在。垂径定理6
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