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Distance between circles.

Solution

Let’s see what happens when we rotate the upper circle by \(90°\)

Given, \(r=1\) and \(h=2\) thus \[\sqrt{2 r^{2}+h^{2}}=\sqrt{5}\] If \(\sqrt{2 r^{2}+h^{2}}=2\), thus \[\huge h=\sqrt{2}\]

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