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There may be some occasions when you may want to prepare a file in advance of the lesson.
For example Pin Boards are great for geometrical reasoning but the construction is not very helpful.
Select Equal Aspect Mode and make sure the snap is set to 1.
This equation is of a circle with centre (a – mint(a/m), int(a/m)).
So m is the number of columns and a is the set of integers between 0 and the number of circles.
This file can now be used to create any rectangular Pin Board.
This is the equation of a circle of radius r with centre on the circumference of a circle with radius s.
Select the large circle right-click and Enter Co-ordinates. Set the t-snap to 30.
This point will now snap to the smaller circles you added. This file can now be used to create any circular Pin Board.