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No - a line graph may peak and trough depending on the data marked on the graph - a bit 'like join the dots'.
a point in a curve or on a graph, or a value of a physical quantity, higher than those around it
Pie is tasty. Pi, however, is what you use in periodic functions. +++ And you do so because periodic functions have properties linked to those of the circle. (You can illustrate this by plotting a sine curve on graph-paper, from a circle whose diameter is the peak-peak amplitude of the wave..)
bar graph, double bar graph, line graph, and picto graph
Pie graph, column graph , tally graph, Histogram