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320 = 20 x²
16 = x²
4 = x
p = 5 x 4 = 20m
l = 4 x 4 = 16m
Luas = 320m
Panjang : lebar = 5 : 4
Misal :
Panjang : 5x
Lebar : 4x
320 = 5x.4x
320 = 20x²
320 = 20x²
20 = 20
16 = x²
√16 =√x²
4 = x
Panjang : 5.4 = 20m
Lebar : 4.4 = 16m