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68 = 4s
17 = s
b = d₁ : 2
= 16 cm : 2
= 8 cm
c = s
= 17 cm
a² + b² = c²
a² = c² - b²
a² = 17² - 8²
a² = 289 - 64
a² = 225
√a² = √225
a = 15
d₂ = a × 2
= 15 cm × 2
= 30 cm