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Question
What is the correct Douma’s equation for rectangular tunnels or conduits?
Options:
A .  X² + 10.4 Y² = d²
B .  4X² + 10.4 Y² = d²
C .  4X² + 44.4 Y² = d²
D .  X² – 10.4 Y² = d²
Answer: Option A
Answer: (a).X² + 10.4 Y² = d²
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