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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Javascript The Math.PI Property</title> </head> <body> <script> // Printing PI value document.write(Math.PI); // Prints: 3.141592653589793 document.write("<br>"); // Function to calculate circle area function calculateCircleArea(radius){ var area = (Math.PI) * radius * radius; return area; } document.write(calculateCircleArea(5)); // Prints: 78.53981633974483 document.write("<br>"); document.write(calculateCircleArea(10)); // Prints: 314.1592653589793 </script>