Calculating Area Using Function in Java

What is Area in Mathematical ?

Area is the size and amount of two-dimensional space taken up by an object.Like  Square , Equilateral Triangle , Circle , Rectangle, Parallelogram , Triangle , Ellipse and Trapezoid.

Function

public static int square(int var) {
		return (var * var);
	}
	public static int equilateral_triangle(int side) {	
		side = side * side;
		return (int)(side * 0.43);
	}
	public static int circle(int radius) {
		return (int)((radius * radius)*3.14);
	}
	public static int rectangle(int vala, int valb) {
		return vala * valb;
	}
	public static int parallelogram(int base, int height) {
		return base * height;
	}
	public static int triangle(int base, int height) {
		return (int)((0.5 * base) * height);
	}
	public static int ellipse(int radius1, int radius2) {
		return (int)((radius1 * radius2)*3.14);
	}
	public static int trapezoid(int height, int base1, int base2) {
		return ((base1 + base2) / 2) * height;
	}

Program

//package com.ahirlab.findarea;
import java.util.Scanner;
public class findarea{
	public static void main(String[] args) {
		Scanner userInput = new Scanner(System.in);
		int option=0;		
		int side1 = 0;
		int side2 = 0;
		int side3 = 0;
		int area=0;
		System.out.println("\n 1.Square \n 2.Equilateral Triangle \n 3.Circle \n 4.rectangle\n 5.Parallelogram \n 6.Triangle \n 7.Ellipse \n 8.Trapezoid");
		System.out.print(" Select the Option : ");
		option = userInput.nextInt();
		switch(option){
			case 1: 
			System.out.println(" Square Area ");			
			System.out.print(" Enter The Side Length of Square : ");
			side1 = userInput.nextInt();
			area = square(side1);
			break;
			case 2: 
			System.out.println(" Equilateral Triangle Area ");			
			System.out.print(" Enter The Side Length of Triangle : ");
			side1 = userInput.nextInt();
			area = equilateral_triangle(side1);
			break;
			case 3: 
			System.out.println(" Circle Area ");			
			System.out.print(" Enter The Radius of Circle : ");
			side1 = userInput.nextInt();
			area = circle(side1);
			break;
			case 4: 
			System.out.println(" Rectangle Area ");			
			System.out.print(" Enter The Width of Rectangle : ");
			side1 = userInput.nextInt();			
			System.out.print(" Enter The Height of Rectangle : ");
			side2 = userInput.nextInt();
			area = rectangle(side1,side2);
			break;
			case 5: 
			System.out.println(" Parallelogram Area ");			
			System.out.print(" Enter The Base Length of Parallelogram : ");
			side1 = userInput.nextInt();
			System.out.print(" Enter The Height Length of Parallelogram : ");
			side2 = userInput.nextInt();
			area = parallelogram(side1,side2);
			break;
			case 6: 
			System.out.println(" Triangle Area ");			
			System.out.print(" Enter The Base Length of Triangle : ");
			side1 = userInput.nextInt();
			System.out.print(" Enter The Height Length of Triangle : ");
			side2 = userInput.nextInt();
			area = triangle(side1,side2);
			break;
			case 7: 
			System.out.println(" Ellipse Area ");			
			System.out.print(" Enter The Radius 1 Length of Ellipse : ");
			side1 = userInput.nextInt();
			System.out.print(" Enter The Radius 2 Length of Ellipse : ");
			side2 = userInput.nextInt();
			area = ellipse(side1,side2);
			break;
			case 8:
			System.out.println(" Trapezoid Area ");			
			System.out.print(" Enter The Height Length of Trapezoid : ");
			side1 = userInput.nextInt();
			System.out.print(" Enter The Base 1 Length of Trapezoid : ");
			side2 = userInput.nextInt();
			System.out.print(" Enter The Base 2 Length of Trapezoid : ");
			side3 = userInput.nextInt();
			area = trapezoid(side1,side2,side3);
			break;
		}
		System.out.println(" Area is : "+area+"\n");
		userInput.close();
	}
	public static int square(int var) {
		return (var * var);
	}
	public static int equilateral_triangle(int side) {	
		side = side * side;
		return (int)(side * 0.43);
	}
	public static int circle(int radius) {
		return (int)((radius * radius)*3.14);
	}
	public static int rectangle(int vala, int valb) {
		return vala * valb;
	}
	public static int parallelogram(int base, int height) {
		return base * height;
	}
	public static int triangle(int base, int height) {
		return (int)((0.5 * base) * height);
	}
	public static int ellipse(int radius1, int radius2) {
		return (int)((radius1 * radius2)*3.14);
	}
	public static int trapezoid(int height, int base1, int base2) {
		return ((base1 + base2) / 2) * height;
	}
}

Output