Grid Form

Use this command to change the grid appearance and scaling of the marked coordinate system.

Sketchpad’s coordinate systems can have three possible forms:

· Polar Grid: A polar coordinate system has a set of grid lines that are circles (constant distance from the origin, or r value) and a set of grid lines that pass through the origin (constant angle from the origin, or θ value). Any coordinate system can be made polar.

If the horizontal and vertical axes of a polar coordinate system have different scaling, the constant-distance grid lines appear as ellipses rather than circles.

· Square Grid: A square coordinate system has the same scaling on the horizontal and vertical axes and has horizontal (constant y value) and vertical (constant x value) grid lines. Any coordinate system except one defined in terms of two different distances can be made square.

· Rectangular Grid: A rectangular coordinate system has independent scaling for the horizontal and vertical axes and has horizontal (constant y value) and vertical (constant x value) grid lines. Any coordinate system except one defined in terms of a unit circle can be made rectangular.

If you choose one of these commands with a sketch that doesn’t yet have a coordinate system, Sketchpad creates a default coordinate system with the chosen form.