 | Isaac Sharpless - Geometry - 1879 - 282 pages
...SECTION I! SYMMETRY. I. With respect to an axis. Two points are symmetrical with respect to a line, when the line joining them is bisected at right angles by the given line; thus, A and B are symmetrical with respect to the line OP when AB is bisected at right angles by OP.... | |
 | Harold Hilton - Crystallography - 1903 - 288 pages
...them is bisected by the centre of the sphere *. (3) That P( + ) and R( + ) represent points which are such that the line joining them is bisected at right angles by the \ine O AC. ยง 4. If on any sphere E, F are the poles of the great circles * ie which are extremities... | |
 | Royal Society (Great Britain) - Engineering - 1924 - 796 pages
...if one oxygen atom and a carbon atom lie on the axis, and the other two oxygen atoms are placed so that the line joining them is bisected at right angles by the axis. C03 groups so arranged are shown in the diagram. These two systems are definitely excluded by... | |
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It will be convenient to establish the definition of counterpoints in regard to a given line : two points such that the line joining them is bisected at right angles by the given line, are said to be counter-points in regard to that line. 