Number and Angle Tools

mode_angle_32 Angle

With this tool you can create angles in different ways (also see command Angle):

·        Click on three points to create an angle between these points. The second point selected is the vertex of the angle.

·        Click on two segments to create the angle between them.

·        Click on two lines to create the angle between them.

·        Click on two vectors to create the angle between them.

·        Click on a polygon to create all angles of this polygon.      
Note: If the polygon was created by selecting its vertices in counter clockwise orientation, the Angle tool gives you the interior angles of the polygon.

Note: Angles are created in counter clockwise orientation. Therefore, the order of selecting these objects is relevant for the Angle tool. If you want to limit the maximum size of an angle to 180°, un-check Allow Reflex Angle  on tab Basic of the Properties Dialog.

mode_anglefixed_32 Angle with Given Size

Select two points A and B and type the angle’s size into the text field of the appearing window (also see command Angle).

Note: This tool creates a point C and an angle α, where α is the angle ABC.

mode_area_32 Area

This tool gives you the area of a polygon, circle, or ellipse as a number and shows a dynamic text in the Graphics View (also see command Area).

mode_distance_32 Distance or Length

This tool gives you the distance between two points, two lines, or a point and a line as a number and shows a dynamic text in the Graphics View. It can also give you the length of a segment, the circumference of a circle, or the perimeter of a polygon (also see commands Distance and Length).

mode_slider_32 Slider

Click on any free place in the Graphics View to create a slider for a number or an angle. The appearing dialog window allows you to specify the Name, Interval [min, max], and Increment of the number or angle, as well as the Alignment and Width of the slider (in pixel).

 

Note: In the Slider dialog window you can enter a degree symbol ° or pi (π) for the interval and increment by using the following keyboard shortcuts:

·        Alt-O (Mac OS: Ctrl-O) for the degree symbol °

·        Alt-P (Mac OS: Ctrl-P) for the pi symbol π

 

The position of a slider may be absolute in the Graphics View (this means that the slider is not affected by zooming, but always remains in the visible part of the Graphics View) or relative to the coordinate system (see Properties Dialog of the corresponding number or angle).

 

Note: In GeoGebra, a slider is the graphical representation of a free number or free angle. You can easily create a slider for any existing free number or angle by showing this object in the Graphics View (see Context Menu; see tool mode_showhideobject_16 Show/Hide Object).

mode_slope_32 Slope

This tool gives you the slope of a line and shows a slope triangle in the Graphics View (also see command Slope).


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