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cari sisi (s)
d² = s² + s²
d² = 2s²
s² = d²/2 = 20²/2 = 400/2 =200
s = √200cm
maka
luas = s²
= (√200)²
= 200 cm²
cara 2
karena persegi maka d₁ = d₂
luas = (d₁ *d₂) / 2
= (20*20)/2
= 400/2
= 200 cm²