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30 = 6x + 6
6x = 24
x = 4
Panjang :
( 4x + 1 ) cm = 17 cm
Lebar :
( 2x + 5 ) cm = 13 cm
Panjang = 4x + 1
lebar = 2x + 5
K = 60 cm
maka :
K = 2 x (p+l)
60 = 2 x [(4x+1)+(2x+5)]
60 = 2 x (6x + 6)
60 = 12 x + 12
12x = 60 - 12
x = 48/12 = 4 cm
panjang = 4x + 1 = 16 +1 = 17 cm
lebar = 2x + 5 = 8 + 5 = 13 cm