6. Can a polygon have curved sides?
A. Yes, if only one side.
B. Yes, if all the sides are curved.
C. No, polygons have straight sides.
D. Maybe, it depends on the figure.

7. What makes a figure a regular polygon?
A. All sides have the same length.
B. All angles are congruent.
C. All angles are 90 degrees.
D. All sides and angles are equal.

8. Which of the following is NOT a polygon?
A. triangle
B. square
C. circle
D. pentagon​