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Just eyeball it

3.81

Best ones were the parrelelogram, right angle and convergence point. Circle was pretty good too.

got a 0.0 on the right angle twice, the original line was directly vertical, so was easy to make sure the line i drew was horizontal.

Im pretty sure the 15.7 i got when i slipped with my mouse put i big downer on my score =/
 
Parallelogram 2.2 2.8 4.1
Midpoint 1.0 0.0 0.0
Bisect angle 0.1 3.8 5.0
Triangle center 2.5 2.2 1.6
Circle center 3.2 8.9 2.2
Right angle 3.0 1.0 1.7
Convergence 2.2 6.0 2.8

Average error: 2.68 (lower is better)


EDIT: Tried again.

Parallelogram 453.3 438.4 409.3
Midpoint 350.1 393.6 394.6
Bisect angle 163.8 126.0 0.7
Triangle center 380.5 213.7 355.2
Circle center 408.6 383.3 366.7
Right angle 179.6 167.0 179.4
Convergence 431.8 367.8 353.4
Average error: 310.32 (lower is better)