Solved
For some reason you have Mathcad in the position where it interprets 5h as 05h (that is 5, hexadecimal, equals 5 decimal). The same for a, it is 4h=4.
Because with h=1/2, you can have either:
a=2 and r=1.25,

OR
a=0 and r=1/4.
Which only plots the circle, as the square has sides of zero, and sits on -1/4,0.
Success!
Luc
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