已知半径R=14 弧长C=16.72 求弦长L和弦到弧的距离H?弧所对的圆心角为A.A=C/R=16.72/14=1.194286弧度=1.194286*180/PI=68.43度L=2*R*SIN(A/2)=2*14*SIN(68.43/2)=15.744H=R-R*COS(A/2)=14-14*COS(68.43/2)=2.423...