A1 noun 중립 #2,705 가장 일반적인

半径

hankei /haŋkeː/

The distance from the center of a circle to its outer edge. It is half of the diameter and is used in both mathematical contexts and to describe a physical area around a specific point.

예시

3 / 5
1

この公園は半径1キロ以内にあります。

This park is within a one-kilometer radius.

2

円の半径を計算してください。

Please calculate the radius of the circle.

3

俺の生活半径、最近すごく狭いんだ。

My living radius has been really small lately.

어휘 가족

명사
半径
관련
直径
💡

암기 팁

The first kanji '半' (han) means 'half'. Think of it as 'half' of the path (径) across the circle.

빠른 퀴즈

この円の直径は10センチなので、_____は5センチです。

정답!

정답은: a

예시

1

この公園は半径1キロ以内にあります。

everyday

This park is within a one-kilometer radius.

2

円の半径を計算してください。

formal

Please calculate the radius of the circle.

3

俺の生活半径、最近すごく狭いんだ。

informal

My living radius has been really small lately.

4

半径が2倍になると、円の面積は4倍になる。

academic

When the radius doubles, the area of the circle quadruples.

5

駅を中心に半径500メートルのエリアを調査します。

business

We will survey the area within a 500-meter radius centered on the station.

어휘 가족

명사
半径
관련
直径

자주 쓰는 조합

半径を測る to measure the radius
半径5メートル a 5-meter radius
行動半径 range of action / activity radius
半径を伸ばす to extend the radius
有効半径 effective radius

자주 쓰는 구문

半径5メートルの幸福

Happiness within a 5-meter radius (finding joy in immediate surroundings)

生活半径

one's daily living sphere

行動半径が広い

to have a wide range of activity

자주 혼동되는 단어

半径 vs 直径

Chokkei (diameter) is the full width of the circle passing through the center, while hankei is only half of that.

📝

사용 참고사항

While primarily a math term, it is very commonly used in daily conversation to talk about how far one travels or the area around a home/station.

⚠️

자주 하는 실수

Learners often confuse the kanji for 'half' (半) and 'flat' (平), or mix up the reading with 'chokkei' (diameter).

💡

암기 팁

The first kanji '半' (han) means 'half'. Think of it as 'half' of the path (径) across the circle.

📖

어원

A Sino-Japanese compound of '半' (half) and '径' (path/diameter).

문법 패턴

Noun + の + 半径 (Radius of...) 半径 + Number + Unit (A radius of X units)
🌍

문화적 맥락

The phrase 'radius of 5 meters' is often used in Japanese media to describe the personal, intimate space of one's direct social circle.

빠른 퀴즈

この円の直径は10センチなので、_____は5センチです。

정답!

정답은: a

관련 단어

unknown

A1

A student attending a university or college for higher education. In Japan, it specifically refers to undergraduate students in a four-year university or a two-year junior college.

革命

A1

A fundamental and sudden change in political power or social structure, often involving a shift in governance. It also refers to a major, transformative shift in technology, thought, or a specific field that completely alters how things are done.

維持

A1

The act of keeping something in its current state, condition, or level over a period of time. It is commonly used to describe the maintenance of health, systems, relationships, or the status quo.

縮小

A1

The act of reducing the size, scale, or scope of something. It is commonly used when talking about downsizing operations, shrinking digital images, or narrowing the range of a project.

契約

A1

A legally binding agreement between two or more parties that specifies terms and conditions. It is commonly used for mobile phones, apartment rentals, and employment agreements.

取引

A1

A transaction or business deal involving the exchange of money, goods, or services. It refers to the process of doing business with another party or making a trade.

借金

A1

A sum of money that is borrowed from a person or an institution and is expected to be paid back. It refers to the state of owing money or the specific amount of debt accumulated.

予算

A1

A budget or an estimate of the amount of money available for a specific purpose. It refers to the financial plan or limit set before spending occurs in personal, business, or government contexts.

賃金

A1

Chingin refers to the money paid to a worker in exchange for labor or services, similar to wages. It is frequently used in formal, legal, and economic contexts, particularly when discussing minimum wage or labor statistics.

降格

A1

A noun or verb that describes a reduction in rank, status, or position within an organization or sports league. It is most commonly used when a worker is moved to a lower job title or when a sports team is moved to a lower division due to poor performance.

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