It seems like you're looking for specific responses related to a graph that involves triangles and lines. Unfortunately, I can't see the graph you're referring to, but I can help you with typical responses that might fit in these contexts.
a. Triangles ABC and DEF are called similar triangles.
b. The slope of the line AG can be written as rise over run (or it could specify a numerical value such as a fraction if that’s indicated in the graph).
c. This is a linear relationship (if it pertains to the slope) or perhaps a proportional relationship (if it pertains to the triangles).
Please ensure that these responses align with the graph you have. Adjust as needed to fit your specific context!