I tried and found by experiment that the tide kept sweeping us westward until I had laid her head due east, or just about right angles to the way we ought to go.
The current had turned at right angles, sweeping round along with it the tall schooner and the little dancing coracle; ever quickening, ever bubbling higher, ever muttering louder, it went spinning through the narrows for the open sea.
There are no more uses of "right angle" in the book.
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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