Your inaccuracy by category:
Parallelogram 15.0 14.9 13.3
Midpoint 8.2 1.4 1.0
Bisect angle 5.2 2.2 1.2
Triangle center 11.2 10.3 1.7
Circle center 2.2 2.8 6.1
Right angle 0.1 5.7 2.5
Convergence 3.0 47.2 11.4
Average error: 7.93 (lower is better)