4 ideas
13007 | Archimedes defined a straight line as the shortest distance between two points [Archimedes, by Leibniz] |
13165 | Geometrical proofs do not show causes, as when we prove a triangle contains two right angles [Proclus] |
6901 | Understanding is needed for imagination, just as much as the other way around [Betteridge] |
9569 | The origin of geometry started in sensation, then moved to calculation, and then to reason [Proclus] |