Answer:
1 is a polygon. 2 and 3 are not.
Step-by-step explanation:
<em>For the first shape:</em>
This shape is a polygon because the sides of the shape are straight, have angles, and do not intersect.
<em>For the second shape:</em>
This is <u>not</u> a polygon because of the lines being bent and having curvature.
<em>For the third shape:</em>
This is <u>not</u> a polygon because the lines intersect at a point.
For a shape to be a polygon, it must have 3 or more straight sides, angles, and no intersections.