I need help with helping my 11 year old daughter with her homework. She needs to create a easily identifiable 3 sided polygon which would be the perfectly productive polygon. HELP PLEASE!!

A three sided polygon is a triangle.

I do not know what a perfect polygon is. Perhaps a regular polygon (all sides equal?) In that case we are talking about an equilateral triangle.
To make one you need a compass and a straight edge.
draw a straight line.
Set you compass to the length of the line.
swing the compass making a circle around the left end
swing the compass making a circle around the right end.
draw the lines from the two ends to one of the circle intersections.
You now have a triangle with all 3 sides equal in length.