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# Make correct statements by filling in the symbol $\subset$ or $\not\subset$ in the black spaces :$\{x : x$ is a triangle in a plane } ________$\{x : x\}$ is a rectangle in the plane }

$\begin{array}{1 1}(A)\;\subset\\(B)\;\not\subset\end{array}$

{x : x is a triangle in a plane }$\not\subset$ {x : x is a rectangle in the plane }
Hence (B) is the correct answer.