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dan lebar = 4, kita tulis 4P
Keliling= 130m
Maka
130m= 4P+9P+4P+9P
130m=26P
P=5m
maka: Panjang persegi panjang = 9P= 9(5)= 45m, dan Lebarnya 4P= 4(5) = 20m
Jadi luasnya= 45m x 20m= 900m²