radius
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
3 / 5The radius of this small circle is only two centimeters.
The distance from the middle of this small circle to its edge is two centimeters.
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.
I live within a short radius of the park.
I live very close to the park area.
語族
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
The radius of this small circle is only two centimeters.
everydayThe distance from the middle of this small circle to its edge is two centimeters.
The scientist measured the radius of the planet to determine its size.
formalThe researcher calculated the distance from the planet's center to its surface.
I live within a short radius of the park.
informalI live very close to the park area.
In geometry, the radius is defined as half of the diameter.
academicIn mathematics, the radius is exactly one-half of the total width of the circle.
Our pizza shop offers free delivery within a five-mile radius.
businessOur store delivers for free to any location within five miles of our building.
語族
よく使う組み合わせ
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
The diameter is the full length across a circle through the center, while the radius is only half that distance.
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
クイックテスト
If the diameter of a circle is 10cm, the ______ is 5cm.
正解!
正解は: radius
関連語彙
A sphere is a perfectly round three-dimensional object where...
mathematicsThe study of numbers, quantities, shapes, and patterns. It i...
geometryGeometry is a branch of mathematics that studies shapes, siz...
diameterThe diameter is the length of a straight line that goes thro...
circumferenceThe circumference is the distance around the outside edge of...
scienceの関連語
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trigonometry
A1Trigonometry 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
A1A 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
A1An 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
A1A 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
A1Hydrogen 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
A1Nitrogen 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
A1A 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
A1A 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
A1A 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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