<?php
$luas = $sisi * $sisi;
$keliling = 4 * $sisi;
echo 'Sisi = '.$sisi. "\n";
echo 'Luas Persegi = sisi . sisi'. "\n";
echo 'Luas Persegi = '. $luas. "\n";
echo 'Keliling Persegi = 4 . sisi'. "\n";
echo 'Keliling Persegi = '. $keliling. "\n";
?>here
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