Complete the constructors and the arcLength method of the Circle class.
public class Circle
{
private double radius;
//constructors
// postcondition: the instance variable is initialized
public Circle(double rad)
{
}
// postcondition: the instance variable is initialized
public Circle(int diameter)
{
}
// postcondition: returns the arcLength of a circle with radius equal to this
// circle's radius, according to the formula: (PI / 180) * r * deg,
// where PI is the value of pi (3.1415…), r is the radius of the circle,
// and deg is the angle in degrees passed as the parameter.
// Use the Math class constant to represent the value of pi.
public double arcLength(double degree)
{
}
// There may be other instance variables, constructors,
// and methods that are not shown.
}
