Area of a right angled triangle

        
<!DOCTYPE html>
<html>
    <head>
        <title>Area of a right angled triangle</title>
    </head>
    <body>
    <h3>Area of a right angled triangle</h3>
    <form name="f1">
    Enter the height value of the triangle:- <input type="number" name="n1" required><br>
    Enter the base value of the triangle:- <input type="number" name="n2" required><br>
    <input type="submit" value="calculate" onclick="area()">
    <input type="reset" value="Clear" alt="Clear the search form"><br>
    Area of the right angled triangle is:- <input type="number" name="n3" readonly><br>
    </form>
    <script type="text/javascript">
    function area()
        { 
            event.preventDefault()
            var h,b,a;
            h = f1.n1.value;
            b = f1.n2.value;
            a = 0.5*b*h;
            f1.n3.value = ""+a;
        }
    </script>
    </body>
</html>


Area of a right angled triangle

Enter the height value of the triangle:-
Enter the base value of the triangle:-

Area of the right angled triangle is:-


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