Here we will see how to calculate area of triangle. We will see two following programs to do this:

1) Program 1: Prompt user for base-width and height of triangle.

2) Program 2: No user interaction: Width and height are specified in the program itself.

**Program 1:**

/** * @author: BeginnersBook.com * @description: Program to Calculate area of Triangle in Java * with user interaction. Program will prompt user to enter the * base width and height of the triangle. */ import java.util.Scanner; class AreaTriangleDemo { public static void main(String args[]) { Scanner scanner = new Scanner(System.in); System.out.println("Enter the width of the Triangle:"); double base = scanner.nextDouble(); System.out.println("Enter the height of the Triangle:"); double height = scanner.nextDouble(); //Area = (width*height)/2 double area = (base* height)/2; System.out.println("Area of Triangle is: " + area); } }

Output:

Enter the width of the Triangle: 2 Enter the height of the Triangle: 2 Area of Triangle is: 2.0

**Program 2:**

/** * @author: BeginnersBook.com * @description: Program to Calculate area of Triangle * with no user interaction. */ class AreaTriangleDemo2 { public static void main(String args[]) { double base = 20.0; double height = 110.5; double area = (base* height)/2; System.out.println("Area of Triangle is: " + area); } }

Output:

Area of Triangle is: 1105.0

Saurabh Yadav says

*

* *

* * *

* * * *

* * * * *

completely coding

chinna says

package coreJava;

/**

* @author Narayana

*

*/

public class Triangle {

public static void main(String[] args) {

int n=5;

for (int i=1;i<=n ;i++ ){

for (int j=1;j<=i ;j++ ){

System.out.print("*");

}

System.out.println( );

}

}

}