Operation:

main points

Example 1 Draw a triangle

Draw three points first (you can hold down the Shift key to draw points continuously); Then draw a triangle with the line segment command in the Construction menu.

Note: The biggest advantage of holding down the Shift key is that all three vertices are selected.

Example 2 draw a polygon

Draw multiple points first (you can hold down the Shift key to draw points continuously); Then use the line segment command in the construction menu (or press CtrL+L directly) to draw the polygon.

Note: The order of selecting vertices is very important. Different orders will lead to different polygons.

Draw the trajectory of a circle with a geometric sketchpad.

line

There are three kinds of line drawing tools: line segment, straight line and ray. When selected, draw in the graphics window.

Example 3 Make a courseware to verify that the perpendicular lines of three sides of a triangle intersect at one point (do a preliminary drawing exercise).

circle

There are three ways to draw a circle.

Draw a circle with the circle drawing tool; Make a circle with two points; Draw a circle with the center and radius (the circle made by this method has a fixed length, and the radius will not change unless the fixed length is changed)

arc

There are also three ways to draw an arc.

Select three points in a certain order and then make an arc (draw an arc counterclockwise from the starting point to the end point); Choose a circle and two points on the circle as an arc (an arc from the first point counterclockwise to the second point); Select three points on the circle as an arc (similar to method 2, except that the circle is not selected, and the original circle can be hidden after the arc is completed, so that the arc of the new work can be seen).

Sector and bow

Similar to the interior of a triangle (three vertices are selected first), sectors and arches contain "faces" instead of just "boundaries". Sector and bow are similar:

Make an arc with the above method, select the arc, and make a sector or arch (shaded part) with the command of "inside sector" (or "inside arch") in the drawing menu.

Measure, calculate

[Measurement] After selecting the inside of the triangle, use the area and perimeter command in the measurement menu to measure the area and perimeter of the triangle. You can set object parameters by using the parameter selection command in the display menu.

[Calculation] The "Calculation" command in the "Measurement" menu can calculate the value of the object and get the required results. Let's take the verification of the "intersection chord theorem" as an example to illustrate.

① Draw a circle and two intersecting chords; ② Measure the length (distance) of four line segments; ③ Select the distance values of two line segments on the same line respectively, and use the calculation command in the Measure menu to calculate the product of them in turn. (4) drag the moving point to observe the law: the intersection theorem.

Draw up a form

[Tabulation] On the measurement menu, click Tabulation. Select the length of four line segments in the above example and use the Table command to make a table. There are three ways to change graphics and add table items: choose the "Add Item" command in the table menu; Select the table and use CtrL+E shortcut key; Double-click the table.

change

"Transform" includes translation, rotation, scaling, reflection and other commands. Each marking command allows you to specify geometric objects, geometric relationships, or measurements that determine the transformation. You can also define your own transformations by combining translation, rotation, scaling, reflection and other transformations.

The Mark Center and Mark Mirror commands determine the type of geometric transformation. Rotation and scaling need a central point, so a central point should be determined before realizing these two transformations. Similarly, reflection needs a mirror, and a mirror must be determined before reflection.

label

The so-called annotation is to give a name to geometric figures such as points, lines, circles and arcs. Geometric objects made with geometric sketchpad are usually marked automatically by the system. Double-click the label text with the Label tool to rename it.

Quick drawing

① Use shortcut keys.

For example, when drawing a polygon, you can use the point drawing tool to draw some points (vertices) first. When drawing points, hold down the Shift key to make them all selected, and then use the straight line segment shortcut key command CtrL+L to draw polygons quickly.

② Use keyboard commands directly to create graphic objects.

In fact, the Geometric Sketchpad provides a way to directly input geometric figures through keyboard commands (several punctuation keys).

Period (. )-draw a dot

Comma (,)-Draw a circle

Slant (/)-Draw lines (including line segments, rays and straight lines, which can be switched by repeated clicking).

Semicolon (; )-draw an arc

Apostrophe (')-Draw a polygon.

Let's draw a polygon (4 sides) as an example to illustrate:

Press the apostrophe (') key, and the tool status bar in the lower left corner of the geometric sketchpad window will display "Draw Polygon";

Enter "A B C D", leaving a space between each letter, and the status bar displays "Draw Polygons A, B, C, D"; Finally, press enter and the polygon (quadrilateral) will be drawn. You can drag each vertex to adjust it.

Import pictures

When making courseware, it is often necessary to import beautiful pictures other than geometric sketchpad to improve the quality of courseware. There are two ways to import external pictures.

① Introduction method

Just like importing external pictures, the mathematical formulas or symbols in Word or WPS are imported into the geometric sketchpad courseware.

② the method of "editing text in mathematical format"

In fact, the Geometry Sketchpad provides commands for inputting commonly used mathematical formulas or symbols (see the table below 1), but it is of little use to beginners. Here is a concrete example to illustrate the usage of these commands.

For example, identify the arithmetic square root (root sign) of 5.

Press and hold the [Num Lock] key, and then double-click the label of point A to pop up the "Edit Mathematical Format Text" dialog box (as shown in figure1); Enter {v: 5} in the "Mathematical Format" column and confirm.

Note: Text created by using the Text tool alone cannot be edited in mathematical format. Only object labels or measured text can "edit mathematical format".

Specific reference/link? URL = MCU JB-dqrgrdvswm 7 pn 8 NX az 3 xcegbdoowh 98 tfxbwiyce qhnsv 5 cc 23 c 1j 0 rbgbfxmtee 53am 1 a6 dytyk 33 uk

Download link (computer version):/SW-search-SP/soft/4e/15467/jhb5.0.6.5.1435219084.exe.