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d₂ = 24 cm
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 = √c
13 = c
s = c
= 13 cm
Jadi panjang sisi belah ketupat adalah 13 cm.