| Euclid - Geometry - 1933 - 328 pages
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| Euclid - 2001 - 420 pages
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| 1882 - 496 pages
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| Mathematics - 1871 - 292 pages
...are the middle points of the sides and A,B,C the intersections of opposite sides. EUCLID XI., &c. I. If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angUs to the plane which passes through... | |
| University of St. Andrews - 1900 - 670 pages
...How can the fourth point of a harmonic range be found, when three points of the range are given ? 6. If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angles to their plane. The sum of the squares... | |
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