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Comprehensive
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quadrant the area of a circle that is enclosed by such an arc and by the radii at either end of it. [1/5 definitions]
radial characterized by or having the parts leading out from a central point like rays or radii. [1/7 definitions]
radian a unit of angular measure. One radian is defined as the angle that is formed when two radii of a circle cut a slice of the circumference that is equal in length to the radius.
sector in geometry, a figure shaped like a piece of pie and determined by an arc of a circle and the two radii that intersect the endpoints of it. [1/4 definitions]