How to change the color of the right angle symbol in the geometric sketchpad

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Make vertical lines and right angle symbols. As shown in the figure, if you draw a line segment on the geometric sketchpad, find the midpoint of the line segment and construct the perpendicular line of the line segment through the midpoint. Select the [Marking Tool] under the toolbox on the left, place the mouse on the midpoint, and drag the mouse along the 45-degree direction, and a vertical right-angle symbol will be automatically marked.

Clear the shadow of the right angle symbol. Select the [Move Arrow] tool in the toolbox on the left side of the geometric sketchpad, select the right-angle symbol with the mouse and right-click, select [Properties] in the pop-up label option, select the [Transparency] label in the pop-up dialog box, and use the mouse to move the sliding button to the end. Left (as shown in the picture), and then click the [OK] button, the inner shadow of the right angle symbol disappears.

Modify the color of the right angle symbol. After the shadow inside the right-angle symbol is cleared, it doesn't look so weird. The next step is to change the color. Use the move tool to select the right-angle symbol, then right-click the mouse and select [Color] from the pop-up shortcut menu. Select the appropriate color under Color, as shown in the figure.

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