I don't believe radar charts are used in mathematics.
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They are almost same except directions, column chart are vertical type and bar chart are are horizontal.
A Gantt chart is a bar chart, but a bar chart is not necessarily a Gantt chart.Bar chart is a much wider decription. It like asking "What's the difference between a fruit and an apple?". The apple is a fruit, but a fruit doesn't have to be an apple...
A composite bar chart is whereby each bar displays multiple data points stacked in a single row or column. On the other hand multiple bar graph are usually placed side by side and use different shapes to contrast between them.
A bar graph is for measuring discontinuous data, for example 'What colour eyes do people in this room have'? This would be a bar chart (number on the y axis and eye colours on the x)A line graph is for measuring continuous data, like temperature, for example.
A bar chart is a graphical representation of data. A frequency table is a table of numbers, which breaks numbers into various groups, based on how often values occurs within ranges.