Your inaccuracy by category:
Parallelogram4.110.83.0Midpoint6.14.12.2Bisect angle6.03.10.7Triangle center4.38.13.2Circle center2.24.17.3Right angle0.22.26.0Convergence5.15.41.0Average error: 4.25 (lower is better)

This is why I don't ever eyeball anything on the job. I can't trust my eyes!