Thinking of writing: You can choose to draw a fan-shaped statistical chart of Party A, Party B and Party C's donations to the disaster area, namely 15 yuan, 27 yuan and 18 yuan. You should write a 200-word math diary and talk about your feelings according to the process of making the fan-shaped statistical chart.

Text: The fan-shaped statistical chart represents the total with the whole circle, and the size of each fan in the circle represents the percentage of each part in the total. The relationship between the number of each part and the total number can be clearly expressed through the fan-shaped statistical chart. Use the area of the whole circle to represent the total, and use the sector area of the circle to represent the percentage of each part in the total. The function is to clearly reflect the relationship between the number of parts and the total number.

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(1) According to the statistical data, sort out or calculate the necessary data (including the percentage of parts in the whole).

(2) According to the data, calculate the degree of the central angle of each sector.

(3) Draw a circle with appropriate radius as required, and divide the circle into several sectors according to the central angle with a protractor.

(4) Write the title of the statistical chart, complete the sector statistical chart with the help of a protractor, and mark the contents of each part and its percentage on each sector. Among them, parts are distinguished by dotted lines, solid lines or different colors.

Refer to the above content: Baidu Encyclopedia-Fan Map