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24 July, 10:48

A fly trapped inside a cubical box with side length 1 meter decides to relieve its boredom by visiting each corner of the box. It will begin and end in the same corner and visit each of the other corners exactly once. To get from a corner to any other corner, it will either fly or crawl in a straight line. What is the maximum possible length, in meters, of its path?

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  1. 24 July, 13:21
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    (4 √ 3 + 4 √2) m

    Step-by-step explanation:

    The insect can travel from one corner directly to opposite corner in four different ways

    each can be calculated using Pythagoras theorem

    firstly for one face we need to calculate the diagonal

    H² = 1² + 1² = 2

    H = √2

    then we calculate the diagonal opposite a corner

    for example

    A to H where A is at the bottom and H opposite A in another plane at the top in the cubical box

    (Interior diagonal for A to H) ² = √2² + 1² = 3

    Interior diagonal from A to H = √ 3

    there are four such corners, the fly will travel 4 √ 3 and it could also go 4 √2 diagonally to the the other corners

    maximum possible length in meters = (4 √ 3 + 4 √2) m
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