Find diameter of the circle in java program?

Answer 1

public class CircleDiameter { publicCircleDiameter() { super(); } publicfloatgetDiameterFrmRadius(float radius){ return radius * 2; } /** * @param args */ public static void main(String[] args) { float radius = 5; CircleDiameter circle = newCircleDiameter(); float dia = circle.getDiameterFrmRadius(radius); System.out.println("Diameter of this circle is: " + dia); } }

Answer 2

/* Program to find out area of circle. */

public class Circle{

public static void main(String args[]) {

int r=5; //radius of circle

// here value of radius initialized.We can take the value at run time.

final double pi=3.i4; // value of pi which is fixed

double area; //To store the area of circle in area variable

area=pi*r*r;

System.out.println("Area of circle = "+area);

} //end of main

} //end of class

Answer 3

// Area of a circle = pi*r2

public static double getArea(double radius) {

return Math.PI * radius * radius;

}