半径
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.
Beispiele
3 von 5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.
円の半径を計算してください。
Please calculate the radius of the circle.
俺の生活半径、最近すごく狭いんだ。
My living radius has been really small lately.
Wortfamilie
Merkhilfe
The first kanji '半' (han) means 'half'. Think of it as 'half' of the path (径) across the circle.
Schnelles Quiz
この円の直径は10センチなので、_____は5センチです。
Richtig!
Die richtige Antwort ist: a
Beispiele
この公園は半径1キロ以内にあります。
everydayThis park is within a one-kilometer radius.
円の半径を計算してください。
formalPlease calculate the radius of the circle.
俺の生活半径、最近すごく狭いんだ。
informalMy living radius has been really small lately.
半径が2倍になると、円の面積は4倍になる。
academicWhen the radius doubles, the area of the circle quadruples.
駅を中心に半径500メートルのエリアを調査します。
businessWe will survey the area within a 500-meter radius centered on the station.
Wortfamilie
Häufige Kollokationen
Häufige Phrasen
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
Wird oft verwechselt mit
Chokkei (diameter) is the full width of the circle passing through the center, while hankei is only half of that.
Nutzungshinweise
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.
Häufige Fehler
Learners often confuse the kanji for 'half' (半) and 'flat' (平), or mix up the reading with 'chokkei' (diameter).
Merkhilfe
The first kanji '半' (han) means 'half'. Think of it as 'half' of the path (径) across the circle.
Wortherkunft
A Sino-Japanese compound of '半' (half) and '径' (path/diameter).
Grammatikmuster
Kultureller Kontext
The phrase 'radius of 5 meters' is often used in Japanese media to describe the personal, intimate space of one's direct social circle.
Schnelles Quiz
この円の直径は10センチなので、_____は5センチです。
Richtig!
Die richtige Antwort ist: a
Verwandtes Vokabular
Ähnliche Wörter
協力
A1Cooperation or collaboration where two or more people combine their efforts to achieve a common goal. It is used in both personal and professional settings to describe working together as a team or providing assistance.
提案
A1A suggestion or proposal of a plan or idea for others to consider. It is used in both casual conversations and professional meetings to introduce a potential course of action.
輸出
A1The act of sending goods or services produced in one country to another country for sale or trade. In Japanese, it functions as a noun and a suru-verb, representing the 'exit' of products from a domestic market.
輸入
A1The act of bringing goods, services, or materials into a country from abroad for sale or use. In Japanese, it functions as a noun or can be combined with 'suru' to become a verb meaning 'to import'.
資源
A1Shigen refers to valuable materials or assets, such as natural minerals, energy sources, or human talent, that can be used for production or survival. It is widely used in economics, environmental science, and daily life to describe both raw materials and abstract wealth.
保護
A1The act of keeping someone or something safe from harm, damage, or loss by providing care or creating boundaries. It is a versatile term in Japanese used for social welfare, environmental conservation, and digital security.
観察
A1Observation is the act of watching someone or something carefully in order to gain information or understand a process. It is frequently used in scientific studies, nature analysis, and describing the act of paying close attention to details.
競争
A1Kyousou refers to the act of competing or vying with others to achieve a goal, win a prize, or establish superiority. It is a versatile term used in sports, business, and academics to describe both structured contests and general rivalry.
拡大
A1The act of making something larger in size, scale, or scope. It is frequently used for physical enlargement (like a photo) or abstract growth (like a business or a problem).
製造
A1The process of making or producing goods, typically on a large scale using machinery. It refers specifically to industrial manufacturing rather than making things by hand on a small scale.
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