The area confined by an arc and two radii is known as what?

The area confined by an arc and two radii is known as a sector. A sector can be visualized as a "slice" of a circle, similar to a piece of pie. It is defined by the two straight lines that are the radii, extending from the center of the circle to the circumference, and the curved line that represents the arc of the circle.

In contrast, a segment refers to a portion of the circle that is bounded by a chord and the arc, not two radii. A tangent is a line that touches the circle at only one point and does not define an area like a sector does. A chord is a straight line that connects two points on the circle but does not encompass an area as a sector does. Thus, the term sector distinctly identifies the area formed with the components specified in the question.