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Verified answer
Luas = 1/2 (a x t)120 cm^2 = 1/2 ( 12x . 5x )
60x^2 = 240
x^2 = 4
x = V4
x = 2
keliling = 12x + 5x + 9x + 8
= 26x + 8
= 26.2 + 8
= 52 + 8
= 60 cm
Verified answer
Jawaban nya A. 60 cm