圆

正方形

椭圆

2.904556

2.739602

2.166273

2.904583

2.739616

2.185276

3.386964

3.094241

2.706215

3.414593

3.051867

2.802062

9.405732e−12

9.995345e−12

7.427342e−12

8753

11229

17647

309

431

487