linear algebra - Reflect the Shape A in the line x = 1. - Mathematics Stack Exchange

I'm not that sure on how to reflect the Shape $A$. I know where the line $x = 1$ but I don't know which way to reflect it. To the left or up? Thanks, I know it seems a bit easy.

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Reflect shape A in the line y = x​

linear algebra - Reflect the Shape A in the line x = 1. - Mathematics Stack Exchange