How to do the drawing board of the second volume of mathematics in senior one

Click and drag the mouse in the drawing area to make a text box.

Open the Geometry Sketchpad, select the "Text Tool" in the left sidebar, click and drag the mouse in the drawing area to display a text box, enter the desired formula, and press enter. When you enter, you can type operation symbols and numbers on the keyboard, or you can enter numbers.

y�� What does this symbol mean in mathematics, and what are the operations related to this symbol?

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