B2nounscienceacademic
US/ˈreɪ.di.əs/
UK/ˈreɪ.di.əs/
the distance from the middle of a circle to its edge, or the area within a set distance
In context
The circle has a radius of five centimeters.
Most of our customers live within a ten-mile radius of the store.
Debris from the explosion landed in a wide radius around the factory.
Words that go with radius
noun + preposition
- within a radius ofHotels within a radius of two kilometers are fully booked.
- radius ofThe radius of the Earth is about 6,400 kilometers.
adjective + noun
- ten-mile radiusEvery school in a ten-mile radius was closed because of the flood.
- wide radiusThe signal covers a wide radius.
noun + noun
- blast radiusThe bomb's blast radius covered several streets.
verb + noun
- measure the radiusUse a ruler to measure the radius of the circle.
Common mistakes
Incorrect:
the radius of the circle is two meterCorrect: the radius of the circle is two meters