Correction for the size of a Playing Card
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How big is 576 squares?
It's about 950,000 times as big as a Playing Card
The size of a Playing Card is about 0.0006 squares.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 0.0006 squares. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 0.00028 squares smaller.