radius

US /ˈreɪ.di.əs/
UK /ˈreɪ.di.əs/
"radius" picture
1.

a straight line from the center to the circumference of a circle or sphere

:
•
The radius of the circle is 5 cm.
•
Calculate the volume of the sphere given its radius.
:
semidiameter
2.

the range or scope of something

:
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The explosion had a destructive radius of 10 miles.
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The store delivers within a 5-mile radius.
:
rangescopeareavicinityproximity