Determine the 11th shape in pattern

Question

(Triangle shaded) (circle) (square shaded) (circle shaded)

I am a third grader so please help me

Answer 1

I just have no idea what it looks like, trying to draw it but no luck.

Answer 2

my guess is the pattern is
3 o 4 o 5 o 6 o 7 o 8 ...
so an octagon