Construct the Midpoint

Using the tools in the toolbar in the center below, construct the point E which is midway between points A and B. This should be easy, since it is something we went over in class.

After you have successfully made the construction, enter the password you get at the bottom of the page so I can give you credit.
This page requires a java-enabled browser for correct functioning. If you can't get it to work, you can do the construction with other software, or pencil and paper. It is easier for me if you can get this to work, of course, since then the computer grades it.

Instructions for using the applet
Each box in the toolbar indicates a different mode or function you can perform. The currently selected mode has a darker background.

The move button allows you to move free elements (like the points A and B) around, while maintaining the relationships between the other elements.
Use point to create points. If you drag the point over another element like a line, it will force it to be on the line. If you drag it over two lines, it will define that point to be the intersection point of the two lines (or line and circle).
This defines a line between two points. Click on the first point, and then drag the other point to where you want it. If you drag it over an existing point, it will use that point. If you drag it to the intersection of two lines or circles, it will define the point as the intersection point.
Note that after clicking the first point, you must keep the mouse button down and drag the second point to where you want it to go.
The compass lets you construct circles of a specified radius. Click on a point at one end of a segment defining the radius, then on the other end. Finally, click on the point where you want the circle to be centered.
This lets you undo an object you constructed.
Click on this to get a hint about what you should try next.
If you want to start all over, click the restart button.

The toolbar, dialog window, and construction applet are over here.

Please enable Java for an interactive construction (with Cinderella). Please enable Java for an interactive construction (with Cinderella).

Please enable Java for an interactive construction (with Cinderella).
enter your Last Name Stony Brook ID and the password then click .

Java exercise created using Cinderella for MAT 360 by Scott Sutherland on March 27, 2004.