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= 12 cm
c = 15 cm
a² + b² = c²
a² = c² - b²
a² = 15² - 12²
a² = 225 - 196
a² = 49
√a² = √49
a = 7
b = 24 cm : 2
= 12 cm
c = 20 cm
a² + b² = c²
a² = c² - b²
a² = 20² - 12²
a² = 400 - 144
a² = 256
√a² = √256
a = 24
d₂ = a + a
= 7 + 24
= 31 cm