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Verified answer
Kita umpamakan panjang dan lebar nya dengan xLebar = 4x
Panjang = 5x
K = 2(p + l)
90 = 2(5x + 4x)
90 = 2(9x)
90 = 18x
90/18 = x
5 = x
Panjang = 5x
= 5(5)
= 25 cm (D)