only 1 use
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- His left arm was somewhat shorter than his right; when he stood or walked, the back of his hand was at right angles to his body, his thumb parallel to his thigh.p. 3.3
right angles = an angle measuring 90 degrees (like the angle between a classroom floor and wall)
There are no more uses of "right angle" in To Kill a Mockingbird.
Typical Usage (best examples)