Skill you are practising: Polygons

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Is this a polygon?

yes
no

Oh no! That was incorrect!

Correct answer is:

yes
no

Here is an explanation

First, let's check the question

Is this a polygon?

yes
no

Your incorrect answer is:

yes
no
Next, let's check the solution.
A closed figure is a figure that starts and ends at the same point. A polygon is a closed figure with straight sides (no arcs/bends etc).
This figure is a polygon. This figure is not a polygon. As you can see that it is closed BUT it does not have straight sides.