Which of these figures are not polygons? a. a, b b. c, d c. a, c, d d. c

Hello!

A polygon is a closed figure. As you can see, B is made up of many lines but it is not closed. A is two polygons touching, but that does not mean the shape itself is a polygon

Therefore, our answer is A) a and b.

I hope this helps!

inverse operation of addition