only 1 use
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- He reached for a pencil, examined its point and dropped it Wynand lifted one wrist slowly to the level of his chest and held it still, the apex of a triangle made by his forearm and the long, drooping fingers of his hand; he was looking down at his wrist watch.4.19 — Part 4 Chapter 19 (18% in)
There are no more uses of "apex" in The Fountainhead.
Typical Usage (best examples)