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d₁ = 10 cm
L = 1/2 × d₁ × d₂
120 = 1/2 × 10 × d₂
120 = 5d₂
24 = d₂
a = d₁ : 2
= 10 cm : 2
= 5 cm
b = d₂ : 2
= 24 cm : 2
= 12 cm
a² + b² = c²
5² + 12² = c²
25 + 144 = c²
169 = c²
√169 = √c²
13 = c
s = c
= 13 cm
K = s × 4
= 13 cm × 4
= 52 cm
Jadi keliling belah ketupat tersebut adalah 52 cm.