Question

In Java write a code that instantiates 5 circles with an even radius between 2 and 10. code the constructor

Answer 1

The student's task is to write Java code to create five circles with even radii between 2 and 10. The code includes a Circle class with a constructor and a main method instantiating the Circle objects. The context involves fitting a circle within a square, calculating the circle's perimeter as it relates to the square's dimensions using π.

Step-by-step explanation:

The student is asked to write a Java code that creates five circles with even radii ranging between 2 and 10 and code the constructor for a circle. In the context provided, each circle's diameter needs to fit perfectly within a square, indicating that the diameter of a circle is equal to the side of the square (a = 2r). This implies that the perimeter of the circle (which is 2πr) should be less than the perimeter of the square (which is 4a) but significantly more than its diagonal (which is 2a). Given that π (pi) is approximately 3.14159, the perimeter of the circle is expected to be close to 6r or 2πr.

Java Code for Creating Circles

public class Circle {
private int radius;

public Circle(int radius) {
this.radius = radius;
}

public static void main(String[] args) {
Circle[] circles = new Circle[5];
for (int i = 0, r = 2; i < circles.length; i++, r += 2) {
circles[i] = new Circle(r);
}
}
}