A program that calculates different shapes

piblic class Shapes{ static void perimeter_triangle(double a,double b,double c){ double perimeter=(a+b+c); system.out.println(perimeter); } static void perimeter_rhombus(double side){ double perimeter=4*side; system.out.println(perimeter); } static void perimeter_square(double side){ double perimeter=4*side; system.out.println(perimeter); } static void area_triangle(double base,double height){ double area=0.5*base*height; system.out.println(area); } static void area_trapezium(double a,double b,double h){ double area=0.5*((a+b)*h); system.out.println(area); } static void area_circle(double r){ final double pi=3.142; double area=pi*(r*r); system.out.println(area); } public static void main(string[]args){ perimeter_triangle(2,4,6); perimeter_rhombus(10); perimeter_square(7.2); area_triangle(4,10); area_trapezium(4.5,3.6,10); area_circle(17); } }