Why do they call it "past 97 degrees" on the Hershey rollercoaster?

Alright, well. Everything I know about geometry seems to be wrong.
At Hershey Park there is a roller coaster called “Fahrenheit.” It has a 97 degree drop. To me, this means that it isn’t quite vertical. But, they called it 7 degrees PAST vertical, making it steeper than a straight fall. Here’s what my thinking is: wouldn’t it be 83 degrees, and not 97? Wouldn’t it be an acute angle, or less than 90?

Right now it seems that everything I’ve learned in high school geometry is bogus.