两圆相交,半径分别为R1=3 cm和R2=4 cm,公共弦长为L=4cm,求两圆的圆心距
圆心距=(R1^2-(L/2)^2)^0.5+(R2^2-(L/2)^2)^0.5
=(3^2-(4/2)^2)^0.5+(4^2-(4/2)^2)^0.5
=5.7cm