<div align="center">
<script type="text/javascript">
function hitungLuas(){
alas = document.getElementById("txtAlas").value;
tinggi = document.getElementById("txtTinggi").value;
Luas = (alas * tinggi)/2;
document.getElementById("txtLuas").value = Luas;
}
</script>
<form name="Mencari Luas Segitiga" method="post" action="hasil.php">
<table width="100%" align="center" border="1" cellpadding="0" cellspacing="0">
<tr>
<td colspan="2" align="center"><h3>Menghitung Luas Segitiga</h3>
</td>
</tr>
<tr>
<td>Masukan Nilai Alas</td>
<td><input type="text" id="txtAlas" name="txtAlas"></td>
</tr>
<tr>
<td>Masukan Nilai Tinggi</td>
<td><input type="text" id="txtTinggi" name="txtTinggi"></td>
</tr>
<tr>
<td> </td>
<td>
<input type="reset" name="reset" value="Reset">
<input type="button" name="hitung" value="Hitung" onclick="hitungLuas()">
</td>
</tr>
<tr>
<td>Luas :</td>
<td><input type="text" id="txtLuas" name="txtLuas" /></td>
</tr>
</table>
</form>
</div>
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