Add volume formulas (#2805)

Co-authored-by: Andrii Siriak <siryaka@gmail.com>

Maths/Volume.java

@@ -0,0 +1,92 @@
+package Maths;
+
+
+/* Find volume of various shapes.*/
+public class Volume {
+  public static void main(String[] args) {
+    
+    /* test cube */
+    assert Double.compare(volumeCube(7), 343.0) == 0;
+    
+    /* test cuboid */
+    assert Double.compare(volumeCuboid(2, 5, 7), 70.0) == 0;
+    
+    /* test sphere */
+    assert Double.compare(volumeSphere(5), 523.5987755982989) == 0;
+    
+    /* test cylinder */
+    assert Double.compare(volumeCylinder(1,2), 12.566370614359172) == 0;
+    
+    /* test hemisphere */
+    assert Double.compare(volumeHemisphere(5), 261.79938779914943) == 0;
+    
+    /* test cone */
+    assert Double.compare(volumeCone(5, 7), 916.297857297023) == 0;
+    
+  }
+  
+  
+  /**
+   * Calculate the volume of a cube.
+   *
+   * @param sideLength side length of cube
+   * @return volume of given cube
+   */
+  private static double volumeCube(double sidelength) {
+    return sidelength * sidelength * sidelength;
+  }
+  
+  /**
+   * Calculate the volume of a cuboid.
+   *
+   * @param width of cuboid
+   * @param height of cuboid
+   * @param length of cuboid
+   * @return volume of given cuboid
+   */
+  private static double volumeCuboid(double width, double height, double length) {
+    return width * height * length;
+  }
+  
+  /**
+   * Calculate the volume of a sphere.
+   *
+   * @param radius radius of sphere
+   * @return volume of given sphere
+   */
+  private static double volumeSphere(double radius) {
+    return 4 / 3 * Math.PI * radius * radius * radius;
+  }
+  
+  /**
+   * Calculate volume of a cylinder
+   *
+   * @param radius radius of the floor
+   * @param height height of the cylinder.
+   * @return volume of given cylinder
+   */
+  private static double volumeCylinder(double radius, double height) {
+    return Math.PI * radius * radius * height;
+  }
+  
+  /**
+   * Calculate the volume of a hemisphere.
+   *
+   * @param radius radius of hemisphere
+   * @return volume of given hemisphere
+   */
+  private static double volumeHemisphere(double radius) {
+    return 2 / 3 * Math.PI * radius * radius * radius;
+  }
+  
+  /**
+   * Calculate the volume of a cone.
+   *
+   * @param radius radius of cone.
+   * @param height of cone.
+   * @return volume of given cone.
+   */
+  private static double volumeCone(double radius, double height) {
+    return Math.PI * radius * radius * height / 3;
+  }
+}