设半径为R,则圆内正方形对角线2R,正方形边长√2R,
圆正六边形边长=半径=R
周长比=边长比=√2R/R=√2
面积比=(√2R)平方/6×1/2×R×Rsin60°=2R平方/(3√3R/2)
=4/(3√3)=(4√3)/9