Detailed steps to draw an angle equal to a known angle on geometric sketchpad

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1. Measure the degree of a known angle. Select the three vertices of the known angle in turn and execute the [Measure] - [Angle] command to measure the degree of the angle.

2. Draw a line segment where you need it as one side of the angle you want to draw, and then double-click one of the endpoints to make it the center of the mark.

3. Select the degree of the known angle to be measured and execute [Transform] - [Mark Angle].

4. Select one side of the drawn angle, execute [Transform] - [Rotate] (in the pop-up rotation dialog box, select the mark angle), click [Rotate] button to get an angle equal to the known angle.

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