根
This Chinese character means root.
You can watch how to write this. - (「根」の書き順（筆順）動画 - 漢字書き順辞典)
There are 2 ways to read this, "ね" or "こん".
"根拠 (こんきょ)" means rationale, basis.
"根幹 (こんかん)" means root, basis.
"根号 (こんごう)" means radical symbol.
Do you remember square root?
Square root is "平方根 (へいほうこん)" in Japanese.
If you cannot understand square root, you also can't understand Pythagorean theorem.
Once you understand the Pythagorean Theorem, you will find mathematics, especially geometry, interesting.
By Higashi-Mikawa Kyōjindō Shujin (東三河狂人堂主人)