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80 = 2 (p + l)
40 = (p + l)
40 = 5x + 3x
40 = 8x
40/8 = x
5=x
Panjang= 5 X 5 = 25 cm
Lebar= 3 X 5 = 15 cm
Luas = p x l = 25 x 15 = 375 cm²