3
![3 \sqrt{7} + 6 \sqrt{6 } 3 \sqrt{7} + 6 \sqrt{6 }](https://tex.z-dn.net/?f=3+%5Csqrt%7B7%7D++%2B+6+%5Csqrt%7B6+%7D++)
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22.63419239
pls if my answer helps
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