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Luas = sisi²
sisi = √Luas
= √(a+2)
Keliling = 4 x sisi
= 4√(a+2)
Jadi panjang sisinya √(a+2) dan kelilingnya 4√(a+2)
s² = (a+2)
s = √(a+2)
K = 4s = 4x√(x+2) = 4√(x+2)