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l = 4x -10
K = 26 cm
K = 2 ( p +l )
26 =2(p+l)
13= p + l
13= 2x+5 +4x-10
13= 6x -5
18 = 6x
3 = x
maka p = 2(3) + 5 = 11 cm
l = 4(3) -10 = 2 cm
26 cm = 2 x ((2x + 5) +(4x - 10))
13 cm = 6x - 5
18 cm = 6x
x = 3 cm
Panjang = 2x + 5
= 2 x 3 + 5 = 11 cm
Lebar = 4x -10 = 4 x 3 - 10 = 2 cm