package Maths;

/**
 * Find the area of various geometric shapes
 */
public class Area {
 public static void main(String[] args) {
 
 /* test cube */
 assert Double.compare(surfaceAreaCube(1), 6.0) == 0;

 /* test sphere */
 assert Double.compare(surfaceAreaSphere(5), 314.1592653589793) == 0;
 assert Double.compare(surfaceAreaSphere(1), 12.566370614359172) == 0;

 /* test rectangle */
 assert Double.compare(surfaceAreaRectangle(10, 20), 200.0) == 0;

 /* test square */
 assert Double.compare(surfaceAreaSquare(10), 100.0) == 0;

 /* test triangle */
 assert Double.compare(surfaceAreaTriangle(10, 10), 50.0) == 0;

 /* test parallelogram */
 assert Double.compare(surfaceAreaParallelogram(10, 20), 200.0) == 0;

 /* test trapezium */
 assert Double.compare(surfaceAreaTrapezium(10, 20, 30), 450.0) == 0;

 /* test circle */
 assert Double.compare(surfaceAreaCircle(20), 1256.6370614359173) == 0;
 }

 /**
 * Calculate the surface area of a cube.
 *
 * @param sideLength side length of cube
 * @return surface area of given cube
 */
 private static double surfaceAreaCube(double sideLength) {
 return 6 * sideLength * sideLength;
 }

 /**
 * Calculate the surface area of a sphere.
 *
 * @param radius radius of sphere
 * @return surface area of given sphere
 */
 private static double surfaceAreaSphere(double radius) {
 return 4 * Math.PI * radius * radius;
 }

 /**
 * Calculate the area of a rectangle
 *
 * @param length length of rectangle
 * @param width width of rectangle
 * @return area of given rectangle
 */
 private static double surfaceAreaRectangle(double length, double width) {
 return length * width;
 }

 /**
 * Calculate the area of a square
 *
 * @param sideLength side length of square
 * @return area of given square
 */
 private static double surfaceAreaSquare(double sideLength) {
 return sideLength * sideLength;
 }

 /**
 * Calculate the area of a triangle
 *
 * @param base base of triangle
 * @param height height of triangle
 * @return area of given triangle
 */
 private static double surfaceAreaTriangle(double base, double height) {
 return base * height / 2;
 }

 /**
 * Calculate the area of a parallelogram
 *
 * @param base base of parallelogram
 * @param height height of parallelogram
 * @return area of given parallelogram
 */
 private static double surfaceAreaParallelogram(double base, double height) {
 return base * height;
 }

 /**
 * Calculate the area of a trapezium
 *
 * @param base1 upper base of trapezium
 * @param base2 bottom base of trapezium
 * @param height height of trapezium
 * @return area of given trapezium
 */
 private static double surfaceAreaTrapezium(double base1, double base2, double height) {
 return (base1 + base2) * height / 2;
 }

 /**
 * Calculate the area of a circle
 *
 * @param radius radius of circle
 * @return area of given circle
 */
 private static double surfaceAreaCircle(double radius) {
 return Math.PI * radius * radius;
 }
}