Answer:1. Non-convex A non-convex polygon has at least one interior angle greater than 180°. 2. Convex All interior angles are less than 180°. 3. Non-convex This is not a polygon; it's a pair of parallel lines. Polygons must be closed figures. 4. Non-convex At least one interior angle is greater than 180°. 5. Convex All interior angles are less than 180°. 6. Non-convex At least one interior angle is greater than 180°. 7. Non-convex At least one interior angle is greater than 180°. 8. Convex All interior angles are less than 180°. 9. Convex All interior angles are less than 180°.