The trihedral angle
作者:
Ya'Akov Nahir,
期刊:
International Journal of Mathematical Education in Science and Technology
(Taylor Available online 1998)
卷期:
Volume 29,
issue 1
页码: 65-82
ISSN:0020-739X
年代: 1998
DOI:10.1080/0020739980290107
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Just as in the common triangle, solving the trihedral angle means getting some of the data and inferring the rest mathematically. Most such problems are solved by solid geometry and by spherical trigonometry. Here we present an approach which facilitates the handling of such problems. Moreover, the two basic theorems (namely, the law of sines and the law of cosines) of spherical trigonometry are derived as relatively simple by‐products of the general approach. Spherical trigonometry is a simple and vivid example of non‐Euclidian geometry and also a vital tool in navigation, astronomy and geodesy, etc. So it is worthwhile to consider it in the early stages of mathematical education.
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