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Pie Graph.
a "circle graph" is also a polar graph, it's used to graph polar coordinates.
the firt and second graph should be circled 2. the bar graph 3. the line graph
The mathematical technique used to calculate the area under a graph is integral calculus. This is a complex subject which I am not going to attempt to explain in detail- it normally takes years of study.
Line Graph, and I know that these are Study Island questions.