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a = s
b = s
c = diagonal
= 8 cm
a² + b² = c²
s² + s² = 8²
2s² = 64
s² = 32
√s² = √32
s = 5,66
Jadi panjang sisi persegi tersebut adalah 5,66 cm (D).
=bd=8
diagonal=s√2
=8=s√2
√64=s√2
s=√32
s=5,66 (d)