How to use geometric sketchpad to create curve point tangents

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Step 1 Drawing a curve

Create an ellipse here. First establish a rectangular coordinate system, click the [Drawing] menu on the upper menu bar, and select the [Define Coordinate System] command in its drop-down menu, like this The coordinate system is established.

Use "Click the [Custom Tools] button on the left sidebar, select [Conic Section A] - Ellipse in the pop-up tool menu, click on the canvas to determine the center of the ellipse and drag the mouse Determine the position of the ellipse, as shown in the figure. "

Step 2 Create a new parameter

Click the [Data] menu in the upper menu bar and select [New] in its drop-down menu. Parameters] command, in the pop-up dialog box, create four parameters in sequence, namely the maximum and minimum values ​​of the x-axis, and the maximum and minimum values ​​of the y-axis, which are used to delineate the range of the tangent line (note: select None for the new parameter unit) .

Step 3 Draw tangent line

Click the [Custom Tool] button on the left sidebar, and select [New Coordinate System] - Curve Point in the pop-up tool menu tangent line,

After selecting the above tools, use the mouse to click on the parameters x-axis maximum value, x-axis minimum value, y-axis maximum value, and y-axis minimum value. Be careful not to make mistakes. order.

Click the elliptical curve again, and a tangent line will appear. Move it to the determined point, and the tangent line will be created.

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