Radius Definition and Meaning
By Fiza Rafique & Urooj Arif — Updated on March 5, 2024
"Radius" is the straight line extending from the center of a circle to its perimeter or from the center of a sphere to its surface. e.g., He measured the radius of the circle accurately.
Table of Contents
Radius Definitions
Radius can describe a range or scope of activity.
The grocery store delivers within a five-mile radius.
Radius pertains to the extent of a circular area.
The park has a radius of four kilometers.
Radius is used for a bone in the forearm.
She fractured the radius in her arm.
Radius denotes a measure of the size of a circular shape.
The artist drew a circle with a radius of 15 cm.
Radius refers to the half-diameter of a circular object.
They calculated the radius to find the area of the circle.
Radius describes the radial distance from a central point.
The circle had a radius extending six centimeters from its center.
Radius can mean a specified area of influence or activity.
The radio station broadcasts within a 50-mile radius.
Radius involves the area within a certain distance from a point.
The explosion affected everything within a two-mile radius.
Radius can refer to a limiting boundary of a specific area.
The wildlife sanctuary covers a radius of several miles.
A line segment that joins the center of a circle with any point on its circumference.
A line segment that joins the center of a sphere with any point on its surface.
A line segment that joins the center of a regular polygon with any of its vertices.
The length of any such line segment.
A circular area measured by a given radius
Every family within a radius of 25 miles of the city center.
A bounded range of effective activity or influence
The operating radius of a helicopter.
A radial part or structure, such as a mechanically pivoted arm or the spoke of a wheel.
A long, prismatic, slightly curved bone in humans, the shorter and thicker of the two forearm bones, located on the lateral side of the ulna.
A similar bone in many other vertebrates.
(anatomy) The long bone in the forearm, on the side of the thumb.
(zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
(entomology) One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
(geometry) A line segment between any point of a circle or sphere and its center.
Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment.
(geometry) The length of this line segment.
A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.
A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
The barbs of a perfect feather.
The length of a line segment between the center and circumference of a circle or sphere
A straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
A circular region whose area is indicated by the length of its radius;
They located it within a radius of 2 miles
The outer and slightly shorter of the two bones of the human forearm
Support consisting of a radial member of a wheel joining the hub to the rim
Radius means a line segment from the center to the circumference of a circle.
The radius of the wheel was 10 inches.
Radius Snonyms
Span
The full extent of something from end to end; the amount of space that something covers.
The bridge has a span of 200 meters.
Reach
The distance within which something can be reached or touched.
The beach is within easy reach of the hotel.
Range
The area of variation between upper and lower limits on a particular scale.
The missile has a range of 500 miles.
Scope
The extent of the area or subject matter that something deals with or to which it is relevant.
The investigation's scope included both local and federal offenses.
Periphery
The outer limits or edge of an area or object.
New buildings on the periphery of the campus were added.
Distance
An amount of space between two things or people.
The distance between the cities is 100 kilometers.
Circumference
The enclosing boundary of a curved geometric figure, especially a circle.
The circumference of the circle was measured accurately.
Semidiameter
Half of the diameter; the radius of a circle or sphere.
The semidiameter helps calculate the area of the circle.
Extent
The area over which something extends; scope.
The extent of the damage was widespread.
Diameter
A straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
The diameter of the tree trunk was over two feet.
Radius Idioms & Phrases
Radius of influence
The area or scope within which someone or something has power or significance.
The politician's radius of influence extends far beyond his own district.
Radius of knowledge
The extent or range of what one knows or understands.
He prides himself on having a wide radius of knowledge.
A tight radius
A small or restricted area of operation or activity.
The spy operated within a tight radius to avoid detection.
Expand one's radius
To increase the range of one's activities or influence.
By networking, she sought to expand her professional radius.
A radius of activity
The area within which someone operates or is active.
The detective's radius of activity was limited to the urban area.
Shrink one's radius
To reduce the scope or range of one's activities or influence.
After the incident, she consciously shrunk her social radius.
Within a radius of
Located inside a specific area surrounding a central point.
They searched for the missing dog within a radius of five miles from the house.
Within one's radius
Within one's area of expertise or interest.
The problem was easily solved once it came within her radius.
Radius of comfort
The range within which one feels comfortable or at ease.
He rarely ventured beyond his radius of comfort.
Radius of opportunity
The range within which opportunities are available.
Moving to a larger city widened her radius of opportunity.
Define one's radius
To establish the limits or boundaries of one's activities or influence.
As a freelancer, he had the freedom to define his own radius of work.
Radius of creativity
The scope or extent of one's creative abilities or ideas.
The artist's residency in Paris greatly expanded her radius of creativity.
A radius of trust
The extent to which one is trusted or the range within which trust is extended.
Within his team, he had a large radius of trust.
Narrow the radius
To reduce the scope, extent, or range of something.
To focus on her health, she needed to narrow the radius of her responsibilities.
Break the radius
To move outside of one's usual area or scope.
He broke the radius of his routine life with a spontaneous trip abroad.
Cross the radius
To go beyond a certain limit or boundary.
The new policy allowed her to cross the radius of her administrative limits.
Within the radius of certainty
Within the range of things that one can be sure about.
The outcome of the experiment fell within the radius of certainty.
Radius of privacy
The personal space or boundaries that one keeps.
He valued his radius of privacy and avoided public gatherings.
Radius of effect
The area over which a particular effect or influence extends.
The new law had a significant radius of effect, impacting several neighboring regions.
Radius of reach
The extent to which one can access, influence, or make an impact.
The charity aimed to extend its radius of reach to more communities.
Radius Example Sentences
The radius of the sphere was hard to calculate.
The pizza place delivers within a 10-mile radius.
The teacher asked them to measure the radius of various circles.
The flower bed was designed with a radius of 2 feet.
The amusement park attracts visitors from a wide radius.
She drew a circle with a 5-inch radius.
He broke the radius in his right forearm.
The radius of the circular garden was 3 meters.
We live within a radius of a good school.
The forest fire affected an area with a 20-mile radius.
The mobile network covers a radius around the city.
He hurt the radius bone in his arm.
The radius of the bicycle wheel determined its size.
Their new dog could wander within a radius of the yard.
The radius of the merry-go-round was quite large.
Common Curiosities
How is radius used in a sentence?
Example: "The radius of the circle was measured to be 5 centimeters."
Why is it called radius?
"Radius" is called so because it comes from the Latin word "radius," meaning "ray" or "spoke of a wheel," originally used to describe the spoke of a chariot wheel and later used in geometry to describe the line from the center to the circumference of a circle.
How many syllables are in radius?
There are three syllables in "radius."
What is the verb form of radius?
There is no verb form of "radius"; it is a noun.
How do we divide radius into syllables?
"Radius" is divided into syllables as ra-di-us.
What is the pronunciation of radius?
Radius is pronounced as /ˈreɪdiəs/.
What is the singular form of radius?
The singular form of "radius" is "radius."
What part of speech is radius?
"Radius" is a noun.
What is a stressed syllable in radius?
The first syllable, "ra," is the stressed syllable in "radius."
Is radius an adverb?
No, "radius" is not an adverb.
What is the root word of radius?
The root word of "radius" is the Latin "radius," meaning "ray" or "spoke of a wheel."
What is the opposite of radius?
There is no direct opposite of "radius," but in context, it could be contrasted with "diameter."
Is radius a negative or positive word?
"Radius" is neutral; it does not have a negative or positive connotation.
Is the radius term a metaphor?
"Radius" can be used metaphorically in some contexts but is generally used in a literal sense, especially in mathematics and geometry.
Which determiner is used with radius?
Determiners such as "the," "a," "an," "this," "that," etc., can be used with "radius."
Which vowel is used before radius?
The choice of vowel before "radius" depends on the preceding word in a sentence.
Is radius a noun or adjective?
"Radius" is a noun.
Is radius an abstract noun?
No, "radius" is a concrete noun, particularly in geometry.
Is radius a collective noun?
No, "radius" is not a collective noun.
Is the word radius Gerund?
No, "radius" is not a gerund. It's a noun.
What is another term for radius?
Another term for "radius" is "semidiameter."
What is the plural form of radius?
The plural form of "radius" is "radii."
Is radius a vowel or consonant?
"Radius" is a word, not a vowel or consonant. However, it starts with a consonant.
Is radius a countable noun?
Yes, "radius" is a countable noun.
Is the word radius is imperative?
No, "radius" is not used in the imperative; it's a noun.
Is the word “radius” a Direct object or an Indirect object?
"Radius" can be used as either a direct object or an indirect object in a sentence, depending on its usage.
Which article is used with radius?
Both "the" and "a" can be used with "radius," depending on whether it's used in a specific or general context.
Which preposition is used with radius?
Prepositions like "of," "in," or "with" can be used with "radius," depending on the context.
Which conjunction is used with radius?
Conjunctions such as "and," "but," or "or" can be used with "radius," depending on the sentence structure.
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Written by
Fiza RafiqueFiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.
Co-written by
Urooj ArifUrooj is a skilled content writer at Ask Difference, known for her exceptional ability to simplify complex topics into engaging and informative content. With a passion for research and a flair for clear, concise writing, she consistently delivers articles that resonate with our diverse audience.
