radius — a straight line from the center of a circle to its edge
Part of speech: NOUN
Definition: a straight line from the center of a circle to its edge
Pronunciation (IPA): /ˈreɪdiəs/
Example Sentences
- My mom can smell burnt food from a 10-meter radius.
- The WiFi signal works within a 50-meter radius of the router.
- Calculate the radius of the circle if the diameter is 20 cm.
radius
NOUN[/ˈreɪdiəs/]
a straight line from the center of a circle to its edge
The student measured the radius of the circle with a ruler.
The radius reached from the center as radio waves spread in every direction. (RADIUS → RADIO → radio waves spread outward from one center like a radius)
The workers carefully measured the radius of the center circle while preparing the stadium for the championship match.
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🎤Pronunciation
🌳Etymology
Origin
The word derives from Latin 'radius', which originally meant 'rod' or 'spoke of a wheel'. The term was extended to geometry, where the spoke-like structure extending from the center of a wheel to its outer edge provided a natural metaphor for the mathematical concept of a line segment from the center of a circle to its circumference.
Breakdown
radius (Latin root) - literally 'rod' or 'spoke', later applied to the geometric line segment from a circle's center to its perimeter.
🎵Rhyme
🔗Collocations
📝Examples
“My mom can smell burnt food from a 10-meter radius.”
“The WiFi signal works within a 50-meter radius of the router.”
“Calculate the radius of the circle if the diameter is 20 cm.”
“There's a cat café within a 2-block radius of every university.”
📚Related Words
Synonyms
Antonyms
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