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sector
A sector of a circle would fit the given description
It could be an arc (a curved portion of the circumference), a chord (the straight line distance between two points) , or a wedge (the plane area bounded by two radii and an arc).Remember the circle is a plane figure, not the curved line we draw. " A circle is bounded ... ."
Working in degrees, the angle of the greater radius, minus the lesser radius, all over 360, gives the proportion of the area of the circle that is bounded by the radii. This can then be multiplied by the area of the whole circle to give the bounded area.
you have a triangle formed by the radius on 2 and the chord on the other. the angle in that triangle that is opposite the chord, find its measure in radians take that measure (in radians) and multiply it by the radius to get the arc length