The road selected was a continuation of the Via Sistina; then by cutting off the right angle of the street in which stands Santa Maria Maggiore and proceeding by the Via Urbana and San Pietro in Vincoli, the travellers would find themselves directly opposite the Colosseum.
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