The operation process of drawing a semicircle on the geometric sketchpad

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Open the Geometry Sketchpad, click [Custom Tools] - [Triangle] - [Right Triangle], click the mouse on the canvas, and then drag the mouse to draw a right triangle.

Use the [Move Arrow Tool] to select the three vertices of the right triangle, click [Construct] on the menu bar - arc passing through three points, and get the shape as shown in the figure.

Select the two right-angled sides of the triangle respectively, right-click and select [Hide Line Segment], so that the semicircle is created, as shown in the picture.

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