Radii is the plural of radius. A radius is the length of a line segment between the center and the circumference of a circle or sphere.
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NO. All the radii of a circle are of exactly the same length. In fact, that is the definition of the locus of a point describing a circle.
The area bounded by an arc of circle and two radii is known as a "circular sector"
Isn't it the radii?
Is a SECTOR. or SEGMENT.
Radii are always positive. No, it is not possible to draw a circle with negative radius.