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<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>Exercicio 30</title>
		<script type = "text/javascript">
			var ladoUm =parseFloat(prompt("lado 1"))
			var ladoDois =parseFloat(prompt("lado 2"))
			var ladoTres =parseFloat(prompt("lado 3"))
			var perimetro =parseFloat((ladoUm + ladoDois + ladoTres)/2)
			var Area = Math.sqrt(perimetro * (perimetro - ladoUm) * (perimetro - ladoDois) * (perimetro - ladoTres) )
			alert("Area = " + Area)
		</script>
	</head>

	<body>

	</body>
</html>