radius
Pronunciation
Noun
B1 Intermediate
Quick answer
The distance from the center of a circle to any point on its edge.
Usage notes
The plural of "radius" can be either "radii" or "radiuses".
Test yourself
Which word fits the gap? "The circle had a _____ of five centimeters."
Answer: radius
In your own words, what does "radius" mean?
The distance from the center of a circle to any point on its edge.
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