Finding the Shortest Path in a Vector Space

[Neophyte]

Homework Statement

A room has dimensions 2.95 m (height) × 4.68 m × 6.19 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the shortest path it can take?


2. Relevant topic
Vectors

The Attempt at a Solution

SQ RT √(2.95²+ (x)²); x = SQ RT of √(4.68² + 6.19²)
= 8.30

Part B, I have problems with as I do not know which one is width/length : (

The answer is
SQ RT
√((w+h)² + (l)²)
But because I do not know which is which I have a slight dilemma... Is there a way to tell?

 

[rl.bhat]

Shorter distance is width.

 

[Neophyte]

Shorter distance is width.

Thank you very much.