Answer:
1:4
Explanation:
The ratio of triangles to circles is 2 triangles to 8 circles, which can be simplified as 1:4. The simplest ratio would be 1:4, meaning for every one triangle, there are 4 circles. This ratio represents the proportion of triangles to circles in the given set, which is 1/5 of the total shapes being triangles, and 4/5 of the total shapes being circles.