46546fc7_Buttons_on_toolbar__ta_to_produce_a_smooth_curve__
Pie chart
The size of the sectors (in degrees) gives the relative magnitudes of the quantities plotted, and labels are printed around the outside of the circle.
Buttons on toolbar
x-y plots are used to plot one varying quantity against another. (Note that data points are joined directly without trying to smooth the data to produce a smooth curve.)