The diagram for the Cooper is shown here.

The 20 Cooper

Place a nail where the course is to begin, this is the 0 mark. Measure from this point out 41 and mark this point. At a right angle to the 0 mark measure 30’ 6", these are your baselines.

On the 41 baseline make a mark at 5, 10, 15, 20, 25, 30, 35, and 41

On the 30 6" baseline make a mark at 5, 10, 15, 20, 25, and 306"

From the baselines make the following marks using the triangle method.

41 Baseline 30 6" Baseline

35" 30

5 20

56" 25

5 30

76" 6, 9, 10 12

10 20

15 20

20 4, 9, 14

21 20

26 20

31 20

36 20

41 4, 9, 156", 20

To Form Circle:

Pull a tape from the 18 mark of the 41 baseline and from the 30 mark of the 306" baseline. Place a mark where these two tapes cross. Using the center mark for the circle as a pivot pull a tape 10. Starting at the mark that is at the 155" on the 41 baseline and 20 on the 306" baseline move counter clockwise and make a mark 22", from that mark move 28", from that mark move 3", from that mark move 5", continue making marks at 3 foot intervals until circle is complete. Distance of final cones will be less that 3.