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= 2(2x - 3) + 2(x + 1)
= 4x - 6 + 2x + 2
= 6x - 4
keliling persegi = 4s
= 4(x + 3)
= 4x + 12
keliling persegi panjang = keliling persegi
6x - 4 = 4x + 12
6x - 4x = 12 + 4
2x = 16
x = 16 / 2
x = 8
panjang sisi persegi = x + 3
= 8 + 3
= 11 cm
4 x s = 2 (p + l)
4 (x+3) = 2 ((2x-3)+(x+1))
4x+12 = 2(2x-3+x+1)
4x+12= 2(3x-2)
4x+12=6x-4
12+4=6x-4x
16=2x
x=16/2
x=8
Sisi persegi = x+3
= 8+3
=11 cm