The specific steps to construct the interior of a triangle using Geometric Sketchpad

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Draw a triangle. Open the mathematics courseware production tool, select the polygon tool in the toolbox on the left (excluding the interior), click twice in the working area and drag the mouse, you will see a triangle coming out, click the mouse in the appropriate position to confirm the third Three vertices, so that △ABC is drawn.

Execute the internal command of the construction-triangle. Use the move tool to select the three vertices A, B, and C of the triangle, then click the Construction menu on the upper menu bar, and select the [Inside the Triangle] command from its drop-down option, as shown in the figure.

Draw the inside of the triangle. After executing the above command, you can draw the inside of the triangle. As shown in the figure, the inside of △ABC is filled with color.

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