根号2乘以圆周率除以根号3-根号2
=√2*3.1415/(√3-√2)
=√2*3.1415(√3+√2)/(√3-√2)(√3+√2)
=3.1415(√6+2)/(3-2)
=3.142(2.449+2)
=3.142*4.449
=13.98