Mark Center

Marks the most recently selected point as the center point about which future rotations and dilations will take place. To mark a center:

If you haven’t yet marked a center when you choose Rotate or Dilate, Sketchpad will automatically choose a point and mark it for you.

· Select a point and choose Mark Center from the Transform menu, or

· Double-click a point with the Selection Arrow tool.

The marked point will flash briefly to indicate it’s been marked as the center for future rotations and dilations. Once marked, this center point will be used for all future rotations and dilations until you mark a different center point.

You can also change the marked center while the Rotate or Dilate dialog box is open by clicking on the desired point in your sketch.