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Explanation:
If the area is [tex]220 \text{ cm}^2[/tex], then the side length is approximately [tex]\sqrt{220} \approx 14.83[/tex]
The side lengths are between 14 and 15 cm.
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Or you could have your steps like this:
[tex]196 < 220 < 225\\\\\sqrt{196} < \sqrt{220} < \sqrt{225}\\\\\boldsymbol{14} < \sqrt{220} < \boldsymbol{15}\\\\[/tex]