algorithm class: pyramid (#1254)

* Added pyramid

* Removed * 1

* Change class name

Geometry/Pyramid.js

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+/**
+ * This class represents a regular pyramid and can calculate its volume and surface area
+ * https://en.wikipedia.org/wiki/Pyramid_(geometry)
+ * @constructor
+ * @param {number} bsl - The side length of the base of the pyramid.
+ * @param {number} height - The height of the pyramid
+ */
+export default class Pyramid {
+  constructor (bsl, height) {
+    this.bsl = bsl
+    this.height = height
+  }
+
+  baseArea = () => {
+    return Math.pow(this.bsl, 2)
+  }
+
+  volume = () => {
+    return this.baseArea() * this.height / 3
+  }
+
+  surfaceArea = () => {
+    return this.baseArea() + this.bsl * 4 / 2 * Math.sqrt(Math.pow(this.bsl / 2, 2) + Math.pow(this.height, 2))
+  }
+}

Geometry/Test/Pyramid.test.js

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+import Pyramid from '../Pyramid'
+
+const pyramid = new Pyramid(3, 5)
+
+test('The Volume of a cone with base radius equal to 3 and height equal to 5', () => {
+  expect(parseFloat(pyramid.volume().toFixed(2))).toEqual(15)
+})
+
+test('The Surface Area of a cone with base radius equal to 3 and height equal to 5', () => {
+  expect(parseFloat(pyramid.surfaceArea().toFixed(2))).toEqual(40.32)
+})