Assessment and Learning in Knowledge Spaces (ALEKS) Practice Exam

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Which term refers to a section of a circle that does not include the center?

Arc
Sector
Chord
Radius

The correct answer is: Arc

The term that refers to a section of a circle that does not include the center is an arc. An arc is defined as a portion of the circumference of a circle. It is characterized by its endpoints, which lie on the circle, and the curved line that joins these points. When considering sections of a circle, an arc provides the visual representation of that part of the circle without encompassing the center area. In contrast, a sector is a section of a circle that does include the center, defined by two radii and the arc connecting them. A chord is a straight line segment whose endpoints both lie on the circle, and it does not encompass any area of the circle itself. A radius is a line segment from the center of the circle to any point on its circumference and is unrelated to sections of the circle in terms of area. Thus, the arc is the correct term for a section of the circle that specifically excludes the center.