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504 = 7a x 2a
504 = 14a²
a² = 504/14 = 36
a = √36 = 6
tinggi = 2a = 2(6) = 12 cm
504 = 7x × 2x
504 = 14x²
14x² = 504
x² = 504
14
= 36
x = √36 = 6 cm
maka tinggi jajargenjang = 2x = 2 × 6 = 12 cm