JavaScript-Mini-Projects/Radius of a Circle.html at main · VIJAYAPANDIANT/JavaScript-Mini-Projects · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Radius of a Circle</title>
</head>
<body>
    <h1 id="myh1">Enter the radius of a circle:</h1>
    <label for="radius">Radius:</label>
    <input type="number" id="radius" name="radius"><br><br>
    <button id="mysubmit">Submit</button>
    <h3 id="myh3"></h3>
    <script>
        document.getElementById("mysubmit").addEventListener("click", function() {
            var radius = parseFloat(document.getElementById("radius").value);
            if (isNaN(radius) || radius <= 0) {
                document.getElementById("myh3").textContent = "Please enter a valid positive number for the radius.";
                return;
            }
            var area = Math.PI * Math.pow(radius, 2);
            var circumference = 2 * Math.PI * radius;
            document.getElementById("myh3").textContent = "Area: " + area.toFixed(2) + ", Circumference: " + circumference.toFixed(2);
        });
    </script>
</body>
</html>