An elementary treatise on modern pure geometry (1893)
Lachlan, Robert · London, New York, Macmillan and Co. · leaf 108
points, sothat we have three pairs of opposite vertices. The lines connectingeach pair of opposite vertices are the diagonals, so that there arethree diagonals. The triangle formed by the diagonals is calledthe diagonal triangle. A TETRAGRAM. 91 Sometimes it is convenient to denote the lines… … the points ac, bd are a pair of opposite vertices, and the line joiningthem, denoted by e in the figure, is a diagonal. If A, A; B, K;C, C; be the three pairs of opposite vertices, the lines of thetetragram are ABC, ARC, ABC, and ABC. 148. Ex. 1. If .4, .4; B, B; C, C he the pairs of opposite…
Geometry
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