How to use the geometric drawing board to mark the angle as ∠B

Draw the corners. Open the geometric sketchpad, click the [Line Segment Tool] on the left sidebar, draw an arbitrary angle in the right working area, and mark the vertex of the angle with

. Click the [Text Tool] on the left sidebar, and then click the endpoints of the line segment from top to bottom to mark each vertex of the angle. As shown in the figure, we get ∠ABC, or ∠B for short. In addition, there are many ways to input angle symbols in the Geometry Sketchpad.

The standard angle is ∠B. When using the text tool to add labels to vertices, angle symbols are not displayed. To add angle symbols, you can only use the text toolbar. After selecting the text tool, double-click in the blank space to bring up the text box, click the symbol panel in the text toolbar below, select the angle symbol inside, and then click point B to create the text ∠B and move it near the corner. That's it. As shown in the final picture, when the mouse is placed on text B, vertex B will be highlighted.

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