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Verified answer
Keliling Persegi = 4s6x + 16 = 4(2x + 1)
6x + 16 = 8x + 4
8x - 6x = 16 - 4
2x = 12
x (sisi persegi) = 12 ÷ 2 → 6 cm
LUAS PERSEGI = s²
= 6²
→ 36 cm²