A(r1,a1) B(r2,a2)转化为直角坐标系上的点A(r1*cosa1,r1sina1) B(r2cosa2,r2sina2)AB中点C((r1cosa1+r2cosa2)/2,(r1sina1+r2sina2)/2)C点极坐标为( r3,a3)其中r3=根号( (r1cosa1+r2cosa2)^2/4+(r1sina1+r2sina2)^2/4...