Your inaccuracy by category:

Parallelogram 13.0 2.0 7.3
Midpoint 3.2 3.2 8.0
Bisect angle 10.0 0.1 8.8
Triangle center 10.9 12.9 19.2
Circle center 4.5 5.7 9.4
Right angle 28.9 8.5 1.1
Convergence 3.6 2.8 5.0

Average error: 8.00 (lower is better)