Tutoriel:Dessin ou Construction
De GeoGebra Manual
Révision datée du 1 mars 2012 à 16:52 par Noel Lambert (discussion | contributions) (Page créée avec « ==Drawing Geometric Figures and Other Objects== ===Preparations=== * Go to ''Perspectives – Geometry''. ===Drawing Pictures with GeoGebra=== Use the mouse and the followi... »)
Drawing Geometric Figures and Other Objects
Preparations
- Go to Perspectives – Geometry.
Drawing Pictures with GeoGebra
Use the mouse and the following selection of tools in order to draw figures in the Graphics View (e.g. square, rectangle, house, tree,…).
New Point | |
Move | |
Line Through Two Points | |
Segment Between Two Points | |
Delete Object | |
Undo/Redo Buttons | |
Move Graphics View | |
Zoom In/Zoom Out |
What to practice
- How to select an already existing object. Hint: When the pointer hovers above an object, it highlights and the pointer changes its shape from a cross to an arrow. Clicking selects the corresponding object.
- How to create a point that lies on an object. Hint: The point is displayed in a light blue color. Always check if the point really lies on the object by dragging it with the mouse.
- How to correct mistakes step-by-step using the Undo and Redo buttons.
Hint: Several tools allow the creation of points “on the fly”. Therefore, no existing objects are required in order to use the tool.
Exemple: The tool Segment Between Two Points can be applied to two already existing points or to the empty graphics view. By clicking on the graphics view the corresponding points are created and a segment is drawn in between them.
Saving GeoGebra Files
Save your drawing
- Open the File Menu and select Save.
- Select the folder GeoGebra_Introduction in the appearing dialog window.
- Type in a name for your GeoGebra file.
- Click Save in order to finish this process.
Hint: A file with the extension .ggb is created. This extension identifies GeoGebra files and indicates that they can only be opened with GeoGebra.
Hint: Name your files properly: Avoid using spaces or special symbols in a file name since they can cause unnecessary problems when transferred to other computers. Instead you can use underscores or upper case letters within the file name (e.g. First_Drawing.ggb).
What to practice
- How to open a new GeoGebra window using New Window from the File Menu.
- How to open a blank GeoGebra interface within the same window (menu File – New) Hint: If you didn’t save the existing construction yet GeoGebra will ask you to do so before the blank screen is opened.
- How to open an already existing GeoGebra file (menu File – Open).
- Navigate through the folder structure in the appearing window.
- Select a GeoGeoGebra file (extension ‘.ggb’).
- Click Open.
Rectangle Construction
Preparations
- Summarize the properties of a rectangle before you start the construction.
- Open new GeoGebra file.
- Switch to Perspectives - Basic Geometry.
- Change the labeling setting to New Points Only (menu Options – Labeling).
Introduction of New Tools
- Perpendicular Line and Parallel Line ToolsHint: Click on an already existing line and a point in order to create a perpendicular line/parallel line through this point.
- Intersect Two Objects Tool Hint: Click on the intersection point of two objects to get this one intersection point. Successively click on both objects to get all intersection points.
- Polygon Tool Hint: Click on the Graphics View or already existing points in order to create the vertices of a polygon. Connect the last and first vertex to close the polygon! Always connect vertices counterclockwise!
Hint: Don’t forget to read the toolbar help if you don’t know how to use a tool.
Hint: Try out all new tools before you start the construction.
Construction Steps
Check your Construction
- Apply the drag test to check if the construction is correct.
- Show the Navigation bar for construction steps (View Menu) to review your construction step-by-step using the buttons.
- Show the Construction Protocol (View Menu) and use it to review your rectangle construction step-by-step.
- Try to change the order of some construction steps by dragging a line with the mouse. Why does this NOT always work?
- Group several constructions steps by setting breakpoints:
- Show the column Breakpoint (Right click on the construction protocol window Columns - Breakpoint)
- Group construction steps by checking the Breakpoint box of the last one of the group
- Change setting to Show Only Breakpoints (Right click on the construction protocol window Options – Show Only Breakpoints)
- Use the navigation bar to review the construction step-by-step. Did you set the breakpoints correctly?
Equilateral Triangle Construction
Preparations
- Summarize the properties of an equilateral triangle before you start the construction.
- Open a new GeoGebra window.
- Hide Algebra View, Input Bar and coordinate axes (View Menu).
- Change the labeling setting to New points only (menu Options – Labeling).
Introduction of New Tools
- Circle with Center through Point Tool Hint: First click creates center, second click determines radius of the circle.
- Show / Hide Object Tool Hint: Highlight all objects that should be hidden, then switch to another tool in order to apply the visibility changes!
- Angle Tool Hint: Click on the points in counterclockwise direction! GeoGebra always creates angles with mathematically positive orientation.
Hint: Don’t forget to read the toolbar help if you don’t know how to use a tool.
Hint: Try out all new tools before you start the construction.
Construction Steps
Check your Construction
- Apply the drag test to check if the construction is correct.
- Show the navigation bar or use the Construction Protocol to review your construction step-by-step.
Use the Properties Dialog to Enhance your Construction
There are different ways to access the Properties dialog:
- Right-click (MacOS: Ctrl-click) an object
- Select Object Properties… from the Edit Menu
- Double click an object in move mode
- Toggle Styling Bar on the right hand side of the Graphics View
What to practice…
- Select different objects from the list on the left hand side and explore the available properties tabs for different types of objects
- Select several objects in order to change a certain property for all of them at the same time Hint: Hold the Ctrl-key (MacOS: Open Apple-click) pressed and select all desired objects.
- Select all objects of one type by clicking on the corresponding heading.
- Show the value of different objects and try out different label styles.