Abstract
The trigonometric functions already defined make it possible to use angles to calculate unknown quantities in plane rectilinear figures. Angles can often be measured with less effort and greater accuracy than lengths. As the name indicates, trigonometry is concerned with the measurement or calculation of triangles into which every figure bounded by straight lines can be subdivided by diagonals. In this one always has in mind the use of known angles.
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© 1975 VEB Bibliographisches Institut Leipzig
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Gellert, W., Gottwald, S., Hellwich, M., Kästner, H., Küstner, H. (1975). Plane trigonometry. In: Gellert, W., Gottwald, S., Hellwich, M., Kästner, H., Küstner, H. (eds) The VNR Concise Encyclopedia of Mathematics. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6982-0_12
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DOI: https://doi.org/10.1007/978-94-011-6982-0_12
Publisher Name: Springer, Dordrecht
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