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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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