Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter V, Sec. 2
Source: Mathematics as an Educational Task (1973), p. 476-477
Source: Vorkosigan Saga, Diplomatic Immunity (2002), Chapter 4 (p. 52)
“Creativity arises from our ability to see things from many different angles.”
Source: How to Be an Explorer of the World: Portable Life Museum
“Time, so to say, runs at right angles to the page at each point on the curve.”
Source: Economic Heresies (1971), Chapter VII, The Theory of the Firm, p. 104
Source: Goodbye to All That (1929), Ch.22.
Context: Opposite our trenches a German salient protruded, and the brigadier wanted to "bite it off" in proof of the division's offensive spirit. Trench soldiers could never understand the Staff's desire to bite off an enemy salient. It was hardly desirable to be fired at from both flanks; if the Germans had got caught in a salient, our obvious duty was to keep them there as long as they could be persuaded to stay. We concluded that a passion for straight lines, for which headquarters were well known, had dictated this plan, which had no strategic or tactical excuse.
“If two right lines cut one another, they will form the angles at the vertex equal.”
...
This... is what the the present theorem evinces, that when two right lines mutually cut each other, the vertical angles are equal. And it was first invented according to Eudemus by Thales...
Proposition XV. Thereom VIII.
The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 2 (1789)
Source: The Physics Of Baseball (Second Edition - Revised), Chapter 2, The Flight Of The baseball, p. 15
Source: "Historical and theoretical issues in the problem of modern capitalism", 1928, p. 143
