Change center of rotation in "Connecting the Dots"

Can anyone help me change the center of rotation on slide 5 of the “Connecting the Dots” activity? Connecting the Dots • Activity Builder by Desmos

Thank you!

In the Transformation Functions folder, you’ll see two functions:
X_{rot} and Y_{rot}. To make the center of rotation (a,b) you want to add 2a to X_{rot} and 2b to Y_{rot}.

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