Ok, you take a rectangular and fold it along one of its diagonal, so that the two planes are perpendicular to each other.(adsbygoogle = window.adsbygoogle || []).push({});

Using [tex]a[/tex] and [tex]b[/tex], what is the distance between the pointsAandB([tex]d[/tex])?

My anwer is:

[tex]d = \sqrt{a^2 + b^2 - \frac{2a^2b^2}{a^2 + b^2}} = \sqrt{\frac{a^4 + b^4}{a^2 + b^2}}[/tex]

But I doubt that it's actually correct. :)

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# A question in space geometry

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