conflicting answers (geometry)

[helpthiskid]

I thought I actually understood this. Wow was I wrong. The image is related to the two problems:

1. List the letters of the convex polygons.
A. a, e
B. b, c, f
C. a, b, e, f
D. a, b, c, e, f

2. List the letters of the concave polygons.
A. c
B. a, e
C. b, f
D. b, c, f

 

[Denis]

Do you know what concave and convex mean?

 

[helpthiskid]

yes I do I think I figured it out for 1 I got A and for 2 I got C. a circle is neither convex or concave correct