Problem
1972 AHSME Problem 23
![[asy] draw((0,0)--(0,1)--(2,1)--(2,0)--cycle^^(.5,1)--(.5,2)--(1.5,2)--(1.5,1)--cycle^^(1,2)--(1,0)); [/asy]](/static/aops/047621775f4f75ae22b66f7678a70ef091bc4943.png)
The radius of the smallest circle containing the symmetric figure composed of the 3 unit squares shown above is
\textbf{(A) }\sqrt{2}\qquad \textbf{(B) }\sqrt{1.25}\qquad \textbf{(C) }1.25\qquad \textbf{(D) }\frac{5\sqrt{17}}{16}\qquad \textbf{(E) }\text{None of these}
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