One thing did not please the ladies: he kept bending forward, especially at the beginning of his speech, not exactly bowing, but as though he were about to dart at his listeners, bending his long spine in half, as though there were a spring in the middle that enabled him to bend almost at right angles.
There are no more uses of "right angle" in the book.
Show samples from other sources
The lines intersect at right angles.
He walked slowly toward the truck, his eyes on me the whole way, black beret tilted at exactly the right angle on his head.
Laurie Halse Anderson -- The Impossible Knife of Memory