Operation steps:

1. First draw three circles with their centers on the same straight line. As shown in the figure, the diameters are 50, 10 and 50 respectively;

< p>2. Use the Draw-Circle-Tangent, Tangent, Radius command on the menu bar to draw a circle with a diameter of 80 that is tangent to two circles with a diameter of 50;

3. Then use A circle with a diameter of 130 is tangent to a circle with a diameter of 80. The centers of the circles with diameters of 80, 10 and 130 are on a straight line;

4. Then make two auxiliary lines to make the two in the figure The green line segments are equal;

5. Then press to select the green line segment;

6. Make a square auxiliary line;

7. At the four points Draw an auxiliary line at one place;

8. Draw a circle with a diameter of 80 that is tangent to the auxiliary line above;

9. Then draw a circle with a diameter of 80 A circle with a diameter of 30 that is tangent to a circle with a diameter of 50, and then draw a circle that is tangent to a circle with a diameter of 80, 30, and 50;

10. The upper circle with a diameter of 80 Make a mirror image, and then draw a circle with a diameter of 80 that is tangent to both of them;

11. Use the trim command to remove excess line segments;

12. Draw a green line Line segment, one right-angled side of a right triangle is half of the other;

13. Complete the auxiliary lines, draw a circle with a diameter of 80 that is tangent to the top auxiliary line, and passes through the circle with a diameter of 50 below Make an auxiliary line of 45 degrees in the center of the circle, draw a circle with a diameter of 20, and then tangent to the circle 80 and the circle 20, draw a circle with a diameter of 80;

14. Trim off the excess lines and you are done. .