Answer:
a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. ... a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles.
Explanation:
a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. ... a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles.