What is a method of structuring concepts using a graphical notation in the form of a diagram called?

I would suggest pie charts and histograms do not structure concepts, rather they display data.

didn't even understand the question

little b, I’m not good at maths

I'm not good at maths

I solved it in 0.2 sec

chet, ..."it's all in your mind"..🎭🕶️

Diagrams for representing data and information is used in mathematics in the form of Bar graph, Histogram, Stacked Bar graph, Area graph, Line graph and Bubble graph.