algorithm class: circle (#1252)

Geometry/Circle.js

@@ -0,0 +1,19 @@
+/**
+ * This class represents a circle and can calculate it's perimeter and area
+ * https://en.wikipedia.org/wiki/Circle
+ * @constructor
+ * @param {number} radius - The radius of the circule.
+ */
+export default class Circle {
+  constructor (radius) {
+    this.radius = radius
+  }
+
+  perimeter = () => {
+    return this.radius * 2 * Math.PI
+  }
+
+  area = () => {
+    return Math.pow(this.radius, 2) * Math.PI
+  }
+}