Find the Radius of a circle with a circumference of 60.

Using
Trace (22.1875399) & Trac (21.1875399):
60 / 6 = 10
10 / 22.1875399 = 0.45070341484
0.45070341484 x 21.1875399 =
9.54929658498

Using pi (3.14159265):
60 / 3.14159265 = 19.09859319285
19.09859319285 / 2 =
9.54929659642


*The
Trace & Trac result is more accurate. Even if pi
is taken to the next place value (3.141592653), the
above result using the
Trace & Trac is still more
accurate--
pi must be taken to 3.1415926535 to
achieve  a more accurate result (the
Trace & Trac
can also be extended but it is rarely done).
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The Radius of a Circle is the same length as the Face of an
inscribed Hexagon
The Trace & Trac relation originates in an inscribed Hexagon