The polygon with 7 sides is called _____. 

All congruent polygon are _____.

If the measure of each exterior angle of a regular polygon is ${\left(51\frac{3}{7}\right)}^{\circ }$, then the ratio of the number of its diagonal to the number of its side is:

The sum of the interior angles of a regular hexagon is_____

(A) $360°$

(B) $540°$

(C) $720°$

(D) $900°$

All closed curves form polygons.

Examine the given figure and explain whether it is a polygon or not. (Yes/No)

Examine the given figure and check if it is a polygon. Write Yes/No.