Concept: Use a unit length to represent a quantity, then draw straight lines with different lengths according to the quantity, and then arrange these straight lines in a certain order. This statistical chart is called a bar chart.

Second, the vermicelli map

1. Concept: Pie chart, also known as circular chart or pie chart, uses circles and sectors to express the relationship between the whole and the parts, that is, the circle represents the whole, and each sector in the circle represents different parts of the whole, and the size of the sector reflects the percentage of the parts in the whole. Such a statistical chart is called a pie chart.

Three, broken line statistical chart

1. Concept: use unit length to represent a certain quantity, draw points according to the quantity, and then connect the points in turn with line segments, and the obtained statistical chart is called broken-line statistical chart.