Persegi dan Kubus

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<?php class Persegi { public $sisi; public function luas() { return $this->sisi * $this->sisi; } } class Kubus extends Persegi { public function volume() { return $this->sisi * $this->sisi * $this->sisi; } } $kubus = new Kubus(); $kubus->sisi = 3; echo "Persegi dan Kubus\n"; echo "Sisi = $kubus->sisi cm\n"; echo "Luas Persegi = {$kubus->luas()} cm2 \n"; echo "Volume Balok = {$kubus->volume()} cm3 \n";
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