Vocabulary you need to know regarding graphs:
Sector - each section of a circle graph is called a sector
Vertical Axis - the axis of the graph that travels up and down.
Horizontal Axis - the axis of the graph that travels left and right.
Scale - the "ruler" that measures the height of the graph. Ex. If you were constructing a bar graph to measure population of various countries and the population of the countries you were sampling ranged from 5 million to 95 million you might use a scale of 0 to 100 (million).
Interval - the amount of space between the values on the scale. To use the above example I might choose an interval of 10 (million).
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