"Sector Chart" PPT courseware 4

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"Sector Chart" PPT courseware 4

1. What information do you get from the picture below?

2. Observe the statistical graphs and answer the questions

(1) Which ball game is the most popular?

(2) Which two ball games are equally popular?

(3) What are the two most popular ball games? What is the sum of their percentages?

(4) What do the sectors in the picture represent?

(5) How do you think the percentages in the figure were obtained? What is the sum of all the percentages?

(6) If you are a sports committee member, prepare to organize the whole class to watch ball games. In order to attract as many students as possible to participate, what kind of competition would you organize to watch?

Characteristics of fan charts

1. Use circles and sectors to express the relationship between the whole and parts

2. The circle represents the whole, and each sector represents different parts of the whole.

3. The size of the sector reflects the percentage of the part to the whole

think about it

Observe the picture on the right and answer the questions

(1) If the entire circle represents the population, which sector represents 25% of the population?

(2) If the entire circle represents the number of people in my class, how many people does sector B represent?

(3) If the entire circle represents a 3-pound cake, then approximately how much cake does sector C represent?

Observe, discuss and communicate:

(1) In this statistical chart, the entire circle is divided into ___ sectors. Among these sectors, ____ has the largest area and _____ has the smallest area.

(2) What is the relationship between the area of ​​each sector and the data in the statistical table?

The more people there are, the larger the corresponding sector area is.

(3) Calculation: The sum of the percentages represented by all sectors is: _____. Measure the central angle of each sector in the textbook. The sum of the central angles of these sectors is: _______.

(4) What information can you get from the picture above?

(5) According to the instructions in "Gas Station", can you tell how to draw a fan chart?

(6) From the picture above, what do you think the advantages of the fan chart are: _______________________________.

Steps to create a fan chart

(1) Organize the data into groups and list statistical tables.

(2) Calculate the percentage of each part in the whole.

(3) Calculate the degrees of the corresponding sector central angles of each part.

(4) Use a compass to draw a circle, and then use a protractor to draw the central angles of each circle, thereby dividing the circular surface into several sectors according to percentages.

(5) Mark the percentage of each part to the whole and the corresponding name on the fan chart; and fill in the title.

Class summary

After studying this lesson, what do you know about how to draw fan charts?

(1) Organize the data into groups and list statistical tables.

(2) Calculate the percentage of each part in the whole.

(3) Calculate the degrees of the corresponding sector central angles of each part.

(4) Use a compass to draw a circle, and then use a protractor to draw the central angles of each circle, thereby dividing the circular surface into several sectors according to percentages.

(5) Mark the percentage of each part to the whole and the corresponding name on the fan chart; and fill in the title.

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For more information about the "Fan Chart" PPT courseware, please click the "Fan Chart ppt" tab.

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Update Time: 2024-09-22

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