I saw then that the unusually forlorn and stunted look of the house was partly due to the loss of what is known in New England as the "L": that long deep-roofed adjunct usually built at right angles to the main house, and connecting it, by way of storerooms and tool-house, with the wood-shed and cow-barn.
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