# Interactive Geometry Editor Help

Help on how to use the Interactive Geometry Editor.

1. What is the interactive geometry editor?

It's a tool to create fast geometry figures by using the mouse.

2. Where do I find the interactive geometry editor?

You can go to its page here:
Interactive Geometry Editor
It also appears near the bottom of the page when you write a new post or when you edit one.

3. What does this button do?
Click on the button to go to its description:

4. How to add a point?

When this tool is selected (and it is when you start the program) you can click anywhere in the drawing area and a point will appear.

5. How to move a point?

When this tool is selected you can drag a green point anywhere on the drawing area. You can also drag a blue point on a line or on a circle

6. How to delete a point, line or circle?

Select this tool and then click on what you want to delete. All its dependencies will be deleted too.

7. How to add a segment?

When this tool is selected you have to select to points that are already on the drawing area. A segment will appear between them.

8. How to add a line?

When this tool is selected you have to select to points that are already on the drawing area. A line will appear that passes through them.

9. How to add a ray?

When this tool is selected you have to select to points that are already on the drawing area. A line will appear that passes through them. The ray will start in the first point and will continue in the direction of the other point.

10. How to draw a perpendicular line?

Select this tool and then select the point and the line (the point can even be on the line). The perpendicular from that point to that line will be drawn.

11. How to draw a parallel line?

Select this tool and then select the point and the line. The parallel from that point to that line will be drawn.

12. How to add a middle?

Select this tool and then select the two points. The point that is halfway between them will be drawn.

13. How to add the symmetric of a point to another point?

Select this tool and then select the two points. The point that is the symmetric of the second point to the first point will be drawn.

14. How to intersect two lines?

Select this tool and then select the two lines. The point that is at the intersection of the two lines will be drawn.

15. How to project a point on a line?

Select this tool and then select the point and the line. The projection of the point on the line will be drawn.

16. How to draw a circle from its center and a point on the circle?

Select this tool and then select the two points. The circle that has the center in the first point and passes through the second one will be drawn.

17. How to draw the circle that passes through three points (the circumcircle)?

Select this tool and then select the three points. The circle that passes through the three points (the circumcircle) will be drawn.

18. How to put a point on a line?

Select this tool and then select the line. The point will appear on the line where you have clicked on it. You can move it anytime with the "move point" tool on the line. The point will be blue.

19. How to put a point on a circle?

Select this tool and then select the circle. The point will appear on the circle where you have clicked on it. You can move it anytime with the "move point" tool on the circle. The point will be blue.

20. How to draw the foot of the angle bisector?

Select this tool and then select the three points. The foot of the angle bisector that passes through the second point will be drawn.