Correction for the size of a Playing Card
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How big is 0.0000000280 square perches?
It's about one-seven-thousand-five-hundredth as big as a Playing Card
The size of a Playing Card is about 0.00022 square perches.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 0.00022 square perches. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 0.0001 square perches smaller.