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L = 12
P + L = 60/2
P + 12 = 30
P = 30 - 12
P = 18
L = 12 x 18
L = 216 cm2 . semoga membantu:)
lebar = 12 x 2 = 24
panjang = 60 - 24 = 36
36 : 2 = 18
luas = 18 x 12 = 216 cm2