Neat.

Your inaccuracy by category:
			
Parallelogram	7.1	1.4	0.0
Midpoint	5.4	2.2	1.0
Bisect angle	4.1	3.9	1.2
Triangle center	6.1	2.6	2.4
Circle center	2.8	3.6	1.4
Right angle	1.3	1.8	0.2
Convergence	4.0	2.2	3.2

Average error:   2.76   (lower is better)
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Bitt Faulk