A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 14
t-angled Triangle. A triangle having equal sides is called anEquilateral Triangle. 2o. Parallel Lines are those situ-ated in the same plane, and at thesame distance from each other, at allpoints. Parallel lines may be either straight orcurved. The circumferences of concentric circles,that is,… … Parallel Lines.
Astronomy
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