circumference
の説明 circumference あなたのレベルで:
The circumference is the distance around a circle. If you have a round ball, the distance around the middle is the circumference. It is like the edge of a circle.
We use circumference to talk about round shapes. If you draw a circle on a paper, the line that goes all the way around is the circumference. It is a very useful word in math.
In geometry, the circumference is the total length of the boundary of a circle. You can find it by multiplying the diameter by pi. It is a common term used in schools and science.
The term circumference is standard in technical and mathematical contexts. It refers to the outer boundary of a circular object. Unlike 'perimeter,' which is used for polygons, 'circumference' is specific to curves.
Beyond basic geometry, circumference is used in various fields including geography, where it might describe the distance around the Earth at the equator. It implies a precise, calculated measurement of a circular path.
Etymologically, circumference signifies the 'carrying around' of a boundary. In advanced academic discourse, it can sometimes be used metaphorically to describe the limits or scope of an abstract concept, though this is less common than its literal geometric application.
circumference 30秒で
- Distance around a circle.
- Specific to round shapes.
- Measured in units of length.
- Calculated using pi.
Think of circumference as a special name for the perimeter of a circle. While we use the word 'perimeter' for shapes with straight edges like squares or triangles, we use circumference specifically for round objects.
If you were to take a piece of string and wrap it perfectly around a circular plate, the length of that string would be the circumference. It is a fundamental measurement in geometry and everyday life, helping us understand everything from the size of a bicycle tire to the orbit of a planet.
The word circumference comes from the Latin word circumferentia. This is a combination of two smaller Latin parts: circum, meaning 'around,' and ferre, meaning 'to carry' or 'to bear.'
Essentially, the word describes something that is 'carried around' a shape. It entered English in the 14th century, borrowed from Old French, and has remained a staple in mathematical language ever since. It is fascinating how a word describing a physical path has stayed consistent for over 600 years!
You will most often hear circumference in math class or technical discussions about engineering and science. It is a formal, precise term that is rarely used in casual, slang-filled conversation.
Common collocations include 'measure the circumference' or 'calculate the circumference.' You might also hear it used in biology or medicine, such as measuring the head circumference of a newborn baby to track growth. It is a high-register word that adds clarity when talking about round objects.
While circumference is a technical noun and doesn't have many idioms named after it, it is often used in descriptive phrases:
- Measure the circumference: To determine the size of a round object.
- Expand the circumference: To make the boundary of an area larger.
- Within the circumference: Meaning inside the circular boundary.
- Outside the circumference: Meaning beyond the circular limit.
- A wide circumference: Describing something very large and round.
The word circumference is a countable noun. Its plural form is circumferences, although it is most commonly used in the singular. The stress falls on the second syllable: sur-KUM-fuh-runce.
In IPA, it is written as /sərˈkʌm fərəns/. It rhymes with words like conferrence and reference. When using it in a sentence, it is usually preceded by 'the' or a possessive pronoun like 'its' or 'their.'
豆知識
It combines 'circum' (around) and 'ferre' (to carry).
発音ガイド
Clear stress on the second syllable.
Slightly flatter vowel sounds.
よくある間違い
- Misplacing the stress
- Dropping the 'f' sound
- Adding extra syllables
韻が合う語
難易度
Easy to understand once defined.
Straightforward usage.
Requires clear pronunciation.
Clear sounds.
次に学ぶべきこと
前提知識
次に学ぶ
上級
知っておくべき文法
Noun usage
The circumference is long.
Articles
A circumference of ten.
Subject-Verb Agreement
The circumferences are equal.
レベル別の例文
The circle has a big circumference.
The edge of the circle is long.
Use 'a' before the noun.
Measure the circumference of the ball.
Find the distance around the ball.
Imperative verb.
The circumference is long.
The edge is big.
Subject + verb + adjective.
It is a circle with a small circumference.
The edge is short.
Prepositional phrase.
Look at the circumference.
See the edge.
Imperative.
This is the circumference.
This is the edge.
Demonstrative pronoun.
The circumference is round.
The edge is curved.
Adjective.
I know the circumference.
I have the measurement.
Transitive verb.
The circumference of the wheel is two meters.
Can you calculate the circumference?
The Earth has a very large circumference.
We measured the circumference of the tree trunk.
The circumference is equal to pi times diameter.
She drew a line along the circumference.
The circumference of the pipe is too small.
Check the circumference before you buy the lid.
To find the circumference, you need the radius.
The circumference of the planet is vast.
He wrapped the rope around the circumference of the pole.
The circumference of the table is perfect for six people.
We need to increase the circumference of the circle.
The circumference is a key measurement in geometry.
The circumference of the sun is incredibly large.
She marked the circumference with chalk.
The circumference of the cylinder was measured with precision.
Calculating the circumference is a basic geometric task.
The circumference of the crater is several miles wide.
Engineers must know the circumference of the tunnel.
The circumference of the coin is serrated.
The circumference of the orbit is elliptical in some cases.
The circumference of the drum is quite large.
We calculated the circumference to ensure the belt would fit.
The circumference of the island provides a natural boundary.
The circumference of the lens must be exact for the frame.
He traced the circumference of the bowl with his finger.
The circumference of the storm's eye is shrinking.
The circumference of the wheel determines how far it travels per rotation.
The circumference of the dome is an architectural marvel.
The circumference of the ring is too tight for my finger.
The circumference of the circle is defined by its radius.
The circumference of the globe serves as a reference for navigation.
The circumference of the ancient stone circle is perfectly aligned with the stars.
The circumference of the lens requires a specialized grinding tool.
The circumference of the aperture affects the amount of light entering the camera.
The circumference of the sculpture was carved with intricate detail.
The circumference of the vortex was growing rapidly.
The circumference of the planet is a constant in orbital mechanics.
The circumference of the target was highlighted in bright yellow.
よく使う組み合わせ
慣用句と表現
"Go around the circumference"
To travel along the edge of a circular path.
We decided to walk around the circumference of the lake.
neutral"Within the circumference"
Inside the circular boundary.
Everything within the circumference is protected.
formal"Outside the circumference"
Beyond the circular boundary.
The spectators stood outside the circumference of the ring.
neutral"Expand the circumference"
To increase the size of the boundary.
They plan to expand the circumference of the stadium.
formal"Measure the circumference of"
To find the size of a round object.
I need to measure the circumference of my waist.
neutral"Define the circumference"
To clearly mark the circular edge.
The fence helps define the circumference of the garden.
formal間違えやすい
Both relate to circles.
Diameter is across; circumference is around.
The diameter is 10cm; the circumference is 31.4cm.
Both are parts of a circle.
Radius is half the diameter.
The radius is 5cm.
Both measure boundaries.
Perimeter is for polygons.
The perimeter of the square is 20cm.
Both mean distance around.
Girth is for physical objects like trees or waists.
The tree's girth is huge.
文型パターン
The circumference of [object] is [measurement].
The circumference of the jar is 20cm.
Measure the circumference of [object].
Measure the circumference of the tire.
Calculate the circumference using [formula].
Calculate the circumference using pi.
The circumference is determined by [factor].
The circumference is determined by the radius.
A circle with a circumference of [number].
A circle with a circumference of 10 meters.
語族
名詞
形容詞
関連
使い方
7
丁寧さの度合い
ヒント
Memory Palace
Math Context
Geometry Basics
Countable Noun
Stress
Don't say 'perimeter' for circles.
Latin Roots
Visuals
Scientific precision
Articles
暗記しよう
記憶術
Circum (around) + Ference (ferry/carry). Think of a ferry carrying you around an island.
視覚的連想
A circular track with a runner on the edge.
Word Web
チャレンジ
Measure the circumference of your coffee mug today!
語源
Latin
元の意味： To carry around
文化的な背景
None.
Commonly taught in primary school math.
実生活で練習する
実際の使用場面
School Math Class
- Calculate the circumference
- What is the formula for circumference?
- Find the circumference
Engineering/Construction
- Measure the outer circumference
- Check the circumference
- Pipe circumference
Medical/Health
- Head circumference
- Waist circumference
- Measure the circumference
Geography/Science
- Earth's circumference
- Planetary circumference
- Orbital circumference
会話のきっかけ
"How do you calculate the circumference of a circle?"
"Why is the circumference important in engineering?"
"Can you name three things with a large circumference?"
"Is the circumference of the Earth constant?"
"How does circumference differ from perimeter?"
日記のテーマ
Describe a round object and estimate its circumference.
Explain why we need to know the circumference of objects.
Write a math problem involving circumference.
How would you explain circumference to a child?
よくある質問
8 問自分をテスト
The distance around a circle is called the ___.
Circumference is the specific term for the edge of a circle.
Which shape has a circumference?
Only round shapes have a circumference.
The circumference is the distance across the circle.
That is the diameter; circumference is the distance around.
Word
意味
Distinguishing between these two is key.
Subject + verb + object.
スコア： /5
Summary
The circumference is simply the distance around the edge of a circle.
- Distance around a circle.
- Specific to round shapes.
- Measured in units of length.
- Calculated using pi.
Memory Palace
Math Context
Geometry Basics
Countable Noun
例文
The distance around the tree trunk is its circumference.
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