Class C for example KSRQ.
A graph or chart.
organizational chart
A Great Circle is the largest circle that can be drawn on any sphere. Mercator's Chart projection is the great circle chart.
pie chart
The blue dashed line on the VFR terminal area chart is class D airspace
The magenta dashed line on the VFR terminal area chart is class E airspace
The blue solid line on the VFR terminal area chart is class B airspace
Yes, a circle graph and a pie chart are the same thing
So people looking at the chart or graph will know what it depicts.
A pie chart
A pie chart?
Circle Chart or Circle Graph