rad - i - cal
There are many reasons to learn how to divide radical into syllables. Separating a word like radical into syllables is mainly to make it easier to read and pronounce. The syllable is the smallest sound unit in a word, and the separation of the radical into syllables allows speakers to better segment and emphasize each sound unit.
Knowing how to separate radical into syllables can be especially useful for those learning to read and write, because it helps them understand and pronounce radical more accurately. Furthermore, separating radical into syllables can also be useful in teaching grammar and spelling, as it allows students to more easily understand and apply the rules of accentuation and syllable division.
In the case of the word radical, we find that when separating into syllables the resulting number of syllables is 3. With this in mind, it's much easier to learn how to pronounce radical, as we can focus on perfecting the syllabic pronunciation before trying to pronounce radical in full or within a sentence. Likewise, this breakdown of radical into syllables makes it easier for us to remember how to write it.