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@Terry:
Just noticed, in lesson 2, in your CONSTANTS explanation, line 13, you give the circumference of a circle as R*(pi squared), instead of R*pi*2. (As you know,  R*(pi squared) is the area).

Not quite, area is Pi * r ^ 2 ( not Pi  ^ 2 ) and yes, circumference is  2 * Pi * r.

Speaking of Pi there is a QB64 Function _Pi(x) that will return multiples of Pi eg, _Pi(2) is circumference of a unit circle, a circle with radius = 1.