Different people may have different answers..
- A diagram uses lines, arrows, shapes and so on to explain an idea
- A chart can be a map; or it can show statistics - like a bar-chart
- A figure can be any picture that goes with the text of what someone is writing. It might be a diagram or a chart or it might be a photo. The word is sometimes abbreviated to "Fig." in academic writing: "By 1900, the town extended to the bank of the river. (Fig. 2)"
- A graph is almost always mathematical or statistical - it shows how numbers change: "The graph (Fig. 3) shows how many people lived in the town between 1900 and 1950"
Best regards, Dave
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