（近似)可以使用下面的公式计算。编写程序显示和的结果。 要求：计算出来的近似值保留小数点后面两位。 测试用例： pi is approximately equal to 2.97 pi is approximately equal to 3.01

可以使用下面的程序来计算并显示结果：double pi = 2.97;
double result = pi * pi;System.out.println("The result is approximately equal to: " + String.format("%.2f", result));