===========================> Documento "01.exercicio.html"
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Formulário com PHP</title>
</head>
<body>
<div>
<form method="get" action="01valor.php">
Valor: <input type="number" name="v"/>
<input type="submit" value="Calcular Raiz"/>
</form>
</div>
</body>
</html>
===========================> Documento "01valor.php"
<html>
<head>
<meta charset="UTF-8"/>
<title>Formulário com PHP</title>
</head>
<body>
<div>
<?php
$valor = $_GET["v"];
$rq = sqrt($valor);
echo "A raiz de $valor é ". number_format($rq,2);
?>
<a href="01exercicio.html">Voltar</a>
</div>
</body>
</html>
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