He preach’d one evening from the top of the Court-house steps, which are in the middle of Market-street, and on the west side of Second-street, which crosses it at right angles.
Our city, tho’ laid out with a beautiful regularity, the streets large, strait, and crossing each other at right angles, had the disgrace of suffering those streets to remain long unpav’d, and in wet weather the wheels of heavy carriages plough’d them into a quagmire, so that it was difficult to cross them; and in dry weather the dust was offensive.
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