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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>Document</title>
</head>
<body>
<form onsubmit="calculate(event)">
Enter radius: <input type="number" id="radius" required>
<button type="submit">Submit</button>
</form>
<br>
<div id="output"></div>
<script>
function calculate(event) {
event.preventDefault(); // Prevent form submission
var pi = 3.14;
var r = document.getElementById("radius").value;
var a = pi * r * r;
var c = 2 * pi * r;
document.getElementById("output").innerHTML = "Area = " + a + "<br>Circumference = " + c;
}
</script>
</body>
</html>
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