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= 144 + 81
= 225
d= √225
d= 15
= √144 + 81
= √225
= 15 cm.
2.Diagonal ruang = √p² + l² + t²
= √a² + (2a)² + (3)²
= √a² + 4a² + 9
= √5a² + 9
= 3 + a√5 cm.