How to draw a fan in 30-day weather statistics

First, draw a circle on the paper with a compass;

Then draw the outline of a circle with Gou Xianbi and point out the center of the circle;

Then draw a vertical line with a ruler to split the circle in two, and write "50%" on the left side of the circle;

Finally, with the help of protractor, divide the remaining semicircle into two parts and write "25%" respectively.