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L = 80 cm²
L = 1/2 × d₁ × d₂
80 = 1/2 × 16 × d₂
80 = 8d₂
10 = d₂
Jadi panjang diagonal yang lain adalah 10 cm.
D2 = x
L = 80 cm
Jwb = rumus = D1 x D2 : 2 = L
16 x (x) : 2 = 80
8 x (x) = 80
x = 80 : 8
x = 10 cm
D2 = 10 cm