Answer:

The second question:

Answer:

The third question:

Answer:

The fourth question:

Answer:

This part of the extended data mainly examines the knowledge points of the fan-shaped statistical chart:

A statistical chart with the area of a circle representing the whole and the ratio of the area of a sector to the area of a circle representing the percentage of an item in the whole is a sector statistical chart. The sector chart shows the total with the whole circle, that is, 100o/o, and the sector chart shows the percentage of each part in the total with each sector in the circle.

The relationship between the sector area and its corresponding central angle is as follows: the larger the sector area, the greater the degree of the central angle; The smaller the sector area, the smaller the degree of the central angle.

The relationship between the degree and percentage of the central angle subtended by the sector is: the degree of the central angle = percentage ×360o.

Production steps:

(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.