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Japanese vocabulary · Beginner
How do you say "radius" in Japanese?
半径
hankei
In Japanese, "radius" is 半径 (hankei).
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Pronunciation
Hankei has two flat syllables, han rhyming with 'hun' and kei sounding like 'kay', with no stress pushing either one louder.
Writing and usage
半径 is written using kanji. It's a noun, and this word is also taught inside the Noun Town language learning game, where it appears in interactive lessons alongside hundreds of other everyday words.
Example sentence
半径は円の幅の半分です。
hankei ha en no haba no hanbun desu.
The radius is half the width of the circle.
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How to remember 半径
Hankei starts like 'hand' — stretch your hand from the center of a circle to its edge and that's your radius.
Related words
- circle 円 en
- triangle 三角形 sankakukei
- rectangle 長方形 chouhoukei
- diamond ダイヤモンド daiyamondo
- oval 楕円形 daenkei
- hexagon 六角形 rokkakkei
- pentagon ペンタゴン pentagon
- cube 立方体 rippoutai
- sphere 球面 kyuumen
Browse all Japanese words in the glossary.
Questions about 半径
How do you pronounce 半径?
Hankei has two flat syllables, han rhyming with 'hun' and kei sounding like 'kay', with no stress pushing either one louder.
Is 半径 formal or casual?
半径 is a neutral, everyday word that works in both casual and polite speech. The level of formality comes from the sentence structure around it, not from the word itself.
How is 半径 written in Japanese?
半径 is written using kanji. Romanised, it reads as hankei.
Where can I practice Japanese words for free?
You can play free Japanese minigames in your browser on the Noun Town online games page, with no sign-up needed. Every word in the Japanese glossary also has native audio and an example sentence you can revisit any time.
"Radius" in other languages
Curated by Jack Ratcliffe
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