cannot find symbol variable radius?

Code :

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public class solvearea{
 
    public static double calculatearea(){
 
        double methodArea = (radius*2)*3.1416;
        return methodArea;
}
    public static void main (String[]args){
        System.out.println("Enter shape: ");
        System.out.println("1.Circle, 2.Rectangle, 3.Square, 4.Triangle.");
        System.out.println("Enter number: ");
        double choice = Keyboard.readDouble();
        //circle
        if(choice == 1){
            System.out.println("You have chosen circle... ");
            System.out.println("Enter radius");
            double radius = Keyboard.readDouble();
            double theArea = calculatearea();
            System.out.println(theArea);
   }
}

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help pls....:((:((

simple, you left out the parameter radius from the computearea method

Code :

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public static double computearea(double radius)

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uhm...where do i put that code?

o tried " public static double calculatearea(double radius){ "
doesnt work...
it says cannot be applied to

i copied your first code..
theres no variable 'radius' and
theres no 'Keyboard' class

changes are in bold

Code :

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[b]import java.util.Scanner;[/b]
 
public class solvearea{
 
	public static double calculatearea([b]double radius[/b])
	{
 
		double methodArea = (radius * 2) * 3.1416;
		return methodArea;
	}
 
	public static void main(String[] args)
	{
		[b]Scanner keyboard = new Scanner(System.in);[/b]
		System.out.println("Enter shape: ");
		System.out.println("1.Circle, 2.Rectangle, 3.Square, 4.Triangle.");
		System.out.println("Enter number: ");
		double choice = [b]k[/b]eyboard.readDouble();
		// circle
		if (choice == 1)
		{
			System.out.println("You have chosen circle... ");
			System.out.println("Enter radius");
			double radius = [b]k[/b]eyboard.readDouble();
			double theArea = calculatearea([b]radius[/b]);
			System.out.println(theArea);
		}
	}
}

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