Radious vs. Radius — Which is Correct Spelling?
Edited by Sumaia Saeed — By Maham Liaqat — Updated on May 7, 2024
Radious is the incorrect spelling. Radius is the correct spelling, referring to the distance from the center of a circle to its edge.
Table of Contents
Which is correct: Radious or Radius
How to spell Radius?
Radious
Incorrect Spelling
Radius
Correct Spelling
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Key Differences
"Radius" is derived from the Latin word meaning "ray" or "spoke."
The singular form of "radii" (the plural) is "radius."
Think of "radius" as a "ray" that starts from the circle's center.
How Do You Spell Radius Correctly?
Incorrect: Measure the radious to find the diameter.
Correct: Measure the radius to find the diameter.
Incorrect: The radious determines the size of the circle.
Correct: The radius determines the size of the circle.
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Incorrect: The radious of a pizza is half its diameter.
Correct: The radius of a pizza is half its diameter.
Incorrect: Radious of the circle is 5 cm.
Correct: Radius of the circle is 5 cm.
Incorrect: He calculated the radious of the circular garden.
Correct: He calculated the radius of the circular garden.
Radius Definitions
An area defined by a specific distance from a central point.
The police set up a perimeter with a one-mile radius.
The distance from the center of a circle to its edge.
The radius of the wheel measures 20 inches.
A line segment extending from the center to the circumference of a circle.
Draw the radius from the center of the circle.
In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel.
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.
Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.
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 movable limb of a sextant or other angular instrument.
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
A straight line from the center to the surface of a sphere.
The radius of the Earth is approximately 3,959 miles.
The bone in the forearm on the thumb's side.
The doctor noted a fracture in the radius.
Radius Meaning in a Sentence
Scientists studied the radius of the Earth.
Measure the radius of the wheel to find its circumference.
He drew a circle with a 5-inch radius.
The park has a radius of several miles.
The circle has a radius of 10 centimeters.
The radius of the playground is 50 feet.
The tree fell within a 10-meter radius of the house.
She calculated the radius of the swimming pool.
Measure the radius to determine the circle's size.
The radius of the bone was fractured in the accident.
The doctor examined the radius for any injury.
He used a ruler to measure the circle's radius.
The radius of the coin was measured accurately.
The circle with a 15-centimeter radius was perfectly drawn.
The playground had a radius of 100 yards.
She broke her radius while playing basketball.
Draw a circle with a 2-inch radius.
The radius of the playground encompasses several neighborhoods.
Engineers calculated the radius of the tunnel.
The radius of the circular garden was too small.
The radius of the sports stadium was clearly marked.
The students learned how to calculate a circle's radius.
The radius of the pizza was twice its thickness.
The radius of the sun is about 432,690 miles.
The compass helped him draw a perfect radius.
Radius Idioms & Phrases
Within a radius of (distance)
Within a specified distance from a central point.
They searched within a radius of 5 miles from the crime scene.
A 10-mile radius
An area covering 10 miles from a central point.
The storm affected towns within a 10-mile radius.
In a 1-mile radius
Within an area of 1 mile.
He walked in a 1-mile radius to deliver leaflets.
Outside the radius
Beyond a specified distance.
They traveled outside the radius of the city for a retreat.
Check the radius
Verify the area within a specified distance.
Check the radius for available delivery zones.
Draw a radius around (place)
Mark an area around a specific place.
Draw a radius around the school for the safety zone.
Within arm's radius
Within reachable distance.
She kept her keys within arm's radius for easy access.
Limited radius
A restricted or small area.
The tornado caused destruction within a limited radius.
Radius of influence
The area affected by a person or event.
His generosity extended his radius of influence far beyond the city.
Radius of action
The operational range or reach of something.
The new store will expand the company's radius of action.
Radius of vision
The area within one's field of view.
He scanned his radius of vision for any danger.
Common Curiosities
Why is it called "radius"?
The term "radius" comes from the Latin word meaning "ray" or "spoke," symbolizing the line extending from the circle's center.
How is "radius" used in a sentence?
e.g., The radius of the circle is 7 centimeters.
How many syllables are in "radius"?
There are three syllables in "radius."
What is a stressed syllable in "radius"?
The stressed syllable is "ra."
What is the verb form of "radius"?
"Radius" is a noun and does not have a verb form.
How do we divide "radius" into syllables?
The syllable division is ra-di-us.
What is the pronunciation of "radius"?
The pronunciation is /ˈreɪ.di.əs/.
What part of speech is "radius"?
"Radius" is a noun.
What is another term for "radius"?
A synonym for "radius" is "range."
Is "radius" an abstract noun?
No, "radius" is not an abstract noun.
What is the plural form of "radius"?
The plural form is "radii" or "radiuses."
Is "radius" a collective noun?
No, "radius" is not a collective noun.
What is the root word of "radius"?
The root word is "radius," which originates from Latin.
Is the word "radius" a gerund?
No, "radius" is not a gerund.
What is the singular form of "radius"?
The singular form is "radius."
Is "radius" a noun or adjective?
"Radius" is a noun.
Is "radius" a negative or positive word?
"Radius" is neutral in meaning.
Is "radius" a vowel or consonant?
"Radius" contains both vowels and consonants.
Is "radius" a countable noun?
Yes, "radius" is a countable noun.
Is the word "radius" imperative?
No, "radius" is not imperative.
Is the word "radius" a direct object or an indirect object?
"Radius" can be used as a direct object. Example: "He measured the radius."
Which preposition is used with "radius"?
Prepositions like "within," "in," "of," or "from" are used with "radius."
Which conjunction is used with "radius"?
Conjunctions like "and" or "but" can be used with "radius."
Which article is used with "radius"?
Both "a" and "the" can be used with "radius."
What is the opposite of "radius"?
There isn't a direct opposite, but "diameter" is conceptually related.
Which determiner is used with "radius"?
Determiners like "the," "a," or "this" can be used with "radius."
Is "radius" an adverb?
No, "radius" is not an adverb.
Is the term "radius" a metaphor?
No, "radius" is not a metaphor.
Which vowel is used before "radius"?
The vowel "a" is used before "radius."
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Written by
Maham Liaqat
Edited by
Sumaia Saeed
