Specific operation methods for constructing multiple coordinate systems using geometric sketchpad

Establish a coordinate system and select the [Draw]-[Hide Grid] command to hide the grid.

Select [Draw] - [Draw Point] command, the [Draw Point] dialog box will pop up, select the [Rectangular Coordinate System] radio button, and enter the coordinates (2, 3), Press the [Draw] button to draw point (2, 3). Then enter the coordinates (3, 1) and press the [Draw] button to draw the point (3, 1). Press the [Finish] button to exit.

Select point (2, 3), and then select the [Draw]-[Define Origin] command. A dialog box will pop up asking whether to build a new coordinate system. Of course the answer is [Yes] . So a new coordinate system was established (referred to as the new system to distinguish it from the old system).

Select the x-axis (y-axis, origin or unit point) of the new system and select the [Drawing] - [Mark Coordinate System] command.

Select the point (3, 1) in the old system, select the [Measure]-[Coordinates] command, and find that the measured coordinates are not (3, 1), but ( 1,-2).

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