package Maths; /** * Find the area of various geometric shapes */ public class Area { public static void main(String[] args) { /* test cube */ assert surfaceAreaCube(1) == 6; /* test sphere */ assert surfaceAreaSphere(5) == 314.1592653589793; assert surfaceAreaSphere(1) == 12.566370614359172; /* test rectangle */ assert surfaceAreaRectangle(10, 20) == 200; /* test square */ assert surfaceAreaSquare(10) == 100; /* test triangle */ assert surfaceAreaTriangle(10, 10) == 50; /* test parallelogram */ assert surfaceAreaParallelogram(10, 20) == 200; /* test trapezium */ assert surfaceAreaTrapezium(10, 20, 30) == 450; /* test circle */ assert surfaceAreaCircle(20) == 1256.6370614359173; } /** * Calculate the surface area of a cube. * * @param sideLength side length of cube * @return surface area of given cube */ public 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 */ public 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 */ public 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 */ public 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 */ public 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 */ public 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 */ public 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 */ public static double surfaceAreaCircle(double radius) { return Math.PI * radius * radius; } }