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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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