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1008 = 28n²
n² = 1008/28
n² = 36
n = 6
alas = 7(6) = 42 cm
tinggi = 4(6) = 24 cm
504 = 7a x 2a
504 = 14 a²
504/14 = a²
36 = a
√36 = a
6 = a
alas = 7 x 6 = 42 cm
tinggi = 4 x 6 = 24 cm