The diagonal of the cuboid with dimensions 9 cm x12cm x 20 cm is
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a² = 12² + 9²
a² = 144 + 81
a² = 225
a² = √225
a = 15²
a² + 20² = b²
b² = 20² + 15²
b² = 400 + 225
b² = 625
b = 25
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