刘惠惠1.8

Public class CirdeAndsquare{
	public static void main(string[] args){
		double r = 5.5;
		double c = 2*Math.PI*r;
		double s = r*r*Math.PI;
		System.out.println("圆的周长是:"+c);
		System.out.println("圆的面积是:"+s);
		
		}

}