Is the official radical for 巨 “工” or “匚”?
Since radicals are dictionary headers, &quot;what is the radical of X&quot; is dependent on the dictionary you're looking at.
The most internationally-agreed-upon dictionary radicals for Chinese characters would be the Kangxi Dictionary, which lists it under 「工」. Thankfully, most dictionaries have sets of radicals which are derived from the Kangxi list, and most dictionaries are in agreement with Kangxi's classification.


My edition of Pleco doesn't list the radical as 「匚」.