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panjang: 5x
lebar: x
rumus keliling: 2xpanjang + 2xlebar
5x + 5x + x + x = 83
12x = 83
83 tidak bisa dibagi 12, kalau kelilingnya 84, maka 84 dibagi 12 = 7.
lebar: 7
panjang: 35
luas nya 35 x 7 = 245