A1 noun ニュートラル

radius

/ˈreɪ.di.əs/

A radius is a straight line from the center of a circle to its outer edge. It is also used to describe the distance from a center point in any direction to mark an area.

例文

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1

The radius of this small circle is only two centimeters.

The distance from the middle of this small circle to its edge is two centimeters.

2

The scientist measured the radius of the planet to determine its size.

The researcher calculated the distance from the planet's center to its surface.

3

I live within a short radius of the park.

I live very close to the park area.

語族

名詞
radius
副詞
radially
形容詞
radial
関連
radii
💡

覚え方のコツ

Think of a 'radio' tower sending signals out in a perfect circle from the center point.

クイックテスト

If the diameter of a circle is 10cm, the ______ is 5cm.

正解!

正解は: radius

例文

1

The radius of this small circle is only two centimeters.

everyday

The distance from the middle of this small circle to its edge is two centimeters.

2

The scientist measured the radius of the planet to determine its size.

formal

The researcher calculated the distance from the planet's center to its surface.

3

I live within a short radius of the park.

informal

I live very close to the park area.

4

In geometry, the radius is defined as half of the diameter.

academic

In mathematics, the radius is exactly one-half of the total width of the circle.

5

Our pizza shop offers free delivery within a five-mile radius.

business

Our store delivers for free to any location within five miles of our building.

語族

名詞
radius
副詞
radially
形容詞
radial
関連
radii

よく使う組み合わせ

turning radius the space a vehicle needs to make a turn
small radius a short distance from the center
within a radius inside a specific circular area
search radius the area being looked at for something
atomic radius the size of an atom from its center

よく使うフレーズ

radius of action

the area where someone can be effective or travel

blast radius

the area affected by an explosion

within a ten-mile radius

anywhere inside a ten-mile distance from a point

よく混同される語

radius vs diameter

The diameter is the full length across a circle through the center, while the radius is only half that distance.

radius vs circumference

The circumference is the total distance around the outside of the circle, not the distance from the center.

📝

使い方のコツ

The word is most commonly used in math and science, but it is also frequently used in daily life to describe how far away things are from a central location.

⚠️

よくある間違い

Learners often forget that the plural can be 'radii' (Latin style) or 'radiuses' (standard English), and they frequently confuse it with the diameter.

💡

覚え方のコツ

Think of a 'radio' tower sending signals out in a perfect circle from the center point.

📖

語源

From the Latin word 'radius', which means a staff, a rod, or the spoke of a wheel.

文法パターン

Countable noun Plural: radii or radiuses Often used with the preposition 'of'

クイックテスト

If the diameter of a circle is 10cm, the ______ is 5cm.

正解!

正解は: radius

scienceの関連語

logarithm

A1

A logarithm is a mathematical value that represents the power to which a fixed number, called the base, must be raised to produce a given number. It is essentially the inverse operation of exponentiation, commonly used to simplify complex calculations in science and engineering.

trigonometry

A1

Trigonometry is a branch of mathematics that studies the relationships between the lengths and angles of triangles. It is used to find unknown measurements in shapes and is essential in fields like physics and engineering.

fraction

A1

A fraction is a small part or amount of something larger. In mathematics, it is a way to show a number that is not a whole number, such as 1/2 or 3/4.

integer

A1

An integer is a whole number that does not have a fraction or a decimal part. It can be a positive number, a negative number, or zero.

microscope

A1

A scientific tool used to see very small objects that are not visible to the naked eye. It uses special lenses to make tiny things like cells or bacteria look much larger.

hydrogen

A1

Hydrogen is a chemical element that is the lightest and most common gas in the universe. It has no color or smell and combines with oxygen to make water (H2O).

nitrogen

A1

Nitrogen is a colorless and odorless gas that makes up most of the Earth's atmosphere. It is a chemical element that is essential for all living things to grow, especially plants.

polymer

A1

A polymer is a large molecule made of many smaller units that are connected in a long chain. These materials can be natural, like rubber or wood, or synthetic, like plastic and nylon.

prime number

A1

A prime number is a whole number greater than 1 that cannot be made by multiplying other whole numbers. It can only be divided evenly by itself and the number 1.

ratio

A1

A ratio is a way to compare two amounts of things. It shows how much of one thing there is compared to another thing, like 2 parts water to 1 part juice.

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