Question

write a program to input the radius of a circle and calculate its area ​

Answer 1

Answer:

import java.util.*;

public class Circle

{

public static void main(String args [])

{

Scanner in=new Scanner(System.in);

float r,a;

System.out.println("Enter the radius of the circle");

r=in.nextFloat();

a=(22/7)*Math.pow(r,2);

System.out.println("The area is =" +a);

}

}

Explanation:

● The radius or the area may can be in decimal point so, we should accept the values in float data type.

● For a circle,

Area = pie.r^2.