Angle of ramps?

[mentos54]

While trying to calculate some lengths for our robot, we had to deal with the angles on the ramps to the defenses. In the rulebook, the ramps are at a 13.5 degree angle, with a 3 inch height and a 12 inch hypotenuse. After trying to figure out how to work with this, we realized that it's impossible. However, in the solidworks model, it has a 14.5 degree angle (which does work). Am I safe in assuming we should use this, instead of the rulebook? And has anyone else found similar mistakes?