Added Circle class

lab-01/src/Circle.java

@@ -0,0 +1,28 @@
+public class Circle extends _Point {
+
+    private double radius;
+
+    public Circle(double radius){
+        this.radius = radius;
+        this.setLocation(0, 0);
+    }
+
+    public Circle(double radius, int x, int y){
+        this.radius = radius;
+        this.setLocation(x, y);
+    }
+
+    public void setRadius(double radius) { this.radius = radius; }
+
+    public double getRadius(){ return this.radius; }
+
+    public double getArea() { return (Math.PI*Math.pow(radius, 2)); }
+
+    public double getCircumfrence() { return 2*Math.PI*this.radius; }
+
+    public String toString() {
+        return String.format("Position %s, Radius %f," +
+            "Area %f, Circumference %f ", super.toString(), getRadius(), getArea(), getCircumfrence());
+    }
+
+}