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 Question from Peter, a student: when u have a cube and the inner diagonal is 41.6 how long is the outside diagonal

Hi Peter,

In the diagram below $D$ s the length of an inner diagonal, $F$ is the length of an outside diagonal and $X$ is the length of a side.

Triangles $QPR$ and $QRS$ are right triangles. Use the Pythagorean Theorem.

Penny

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