A rectangle was drawn using a ruler, such that each measurement has
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8 .zxftnqt-/q ty of $0.5 \mathrm{~cm} .$

What is the absolute uncertainty in the area of the entire rectangle (i.e. combined small and big rectangles), in $\mathrm{cm}^2$ ?
$cm^2$ (Do not write units with the answer. Give your answer to 2 significant figures.)