which figure shows a sector?

which figure shows a sector?
Answer
Explanation:
Step1: Recall sector definition
A sector of a circle is the region bounded by two radii and an arc of the circle.
Step2: Analyze each figure
The first figure has two radii and an arc - it is a sector. The second figure just shows two radii without the arc - bounded region. The third figure shows a single radius. The fourth figure shows a diameter.
Answer:
The first figure (the one with the shaded region bounded by two radii and an arc)