Detailed steps for making an isosceles triangle with a vertex angle of 120 degrees using geometric sketchpad

How to make an isosceles triangle with a vertex angle of 120 degrees in Geometry Sketchpad? Many friends have encountered this problem when using Geometric Sketchpad. This article will explain in detail the specific steps of making an isosceles triangle with a vertex angle of 120 degrees in Geometric Sketchpad. Friends in need may wish to take a look below.

Construct line segment AB. Open the Geometry Sketchpad, select the line segment tool on the left sidebar, click once in the work area, and draw an endpoint of the line segment. Then hold down the Shift key, drag the mouse, and click the mouse at the appropriate location to draw a horizontal line. part. Then use the text tool to click on the two endpoints in sequence and mark them as points A and B.

Marked point A is the center of rotation. Then select the Move tool and double-click point A to mark point A as the center of rotation; or select the Mark Center command under the Transform menu.

Perform rotation 30? operate. Use the Move tool to click on the line part of line segment AB. Then line segment AB is selected. Then execute the Rotate command under the Transform menu. The Rotation dialog box will pop up. Change the degree to 30 degrees, and then click Rotate.

Rotate line segment AB with point B as the rotation center. Select the move tool and double-click point B. Mark point B as the center of rotation. Then use the move tool to click on the line part of line segment AB. At this time, line segment AB is selected. Execute the rotate command under the transform menu. A rotation dialog box will pop up to change the degree. to -30 degrees and click Rotate.

Determine the vertex C of the triangle. Use the move tool to select the two sides obtained by rotation, and execute the [Construction]-[Intersection] command, thus marking the intersection point C.

Construct an isosceles triangle. Use the move tool to select the two sides obtained by rotation, press the shortcut key [Ctrl H] to hide it, and select the line segment tool to connect the line segments AC and BC. In this way, the vertex angle is 120? isosceles triangle.

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