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(=) 2(7x) + 2(5x)
(=) 14x + 10x
(=) 24x
120 = 24x
x = 120 / 24
x = 5
Panjang = 7(5) = 35 m
Lebar = 5(5) = 25 m
luas = 35 * 25
= 875 m²
5/12 x 120 = 10 x 5 = 50 / 2 = 25
L = p x l
L = 35 x 25
L = 875 cm²