Sound Problem involving a path difference

AI Thread Summary
The discussion revolves around a sound problem that involves calculating a path difference, specifically focusing on part B of the problem. A user requests clarification on how the equation for part B is derived, particularly questioning the necessity of taking the square root in the solution. The relevant formula for distance, d, is provided as d = sqrt((x2-x1)² + (y2-y1)²). This formula is essential for understanding the geometric aspects of the sound problem. The thread emphasizes the importance of grasping the mathematical principles behind the equation to solve similar problems effectively.
Matt1234
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Attached is the problem and solution for part B, can someone please explain how they obtain the equation for part B, i don't see why they take the root.

Thank you.

Homework Statement


[PLAIN]http://img153.imageshack.us/img153/8149/97578282.jpg
 
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no longer required sorry.

note for those who ever use this thread: d= sqrt ((x2-x1)^2 + (y2-y1)^2)
 
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