Meaning & use
radius
A line segment from a circle's center to its boundary, or the length of that segment.
See it in a sentence
The radius of a circle with diameter 12 centimeters is 6 centimeters.
Set the compass opening to the required radius before drawing the circle.
A note on using this word
Every radius of the same circle has the same length. The plural is radii or radiuses.
Words with a similar meaning
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