A 80-80-20 triangle
Community Mathematics Centre, CoMaC (2016) A 80-80-20 triangle. At Right Angles, 5 (2). pp. 63-65. ISSN 2582-1873
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Abstract
In the previous issue of At Right Angles, we studied a geometrical problem concerning the triangle with angles of 130 ◦ , 20 ◦ and 30 ◦ . We made the comment that the problem belongs to a class of geometrical problems dealing with triangles with numerous lines drawn within them, intersecting at angles whose measures are an integer number of degrees; we are required to find the measure of some indicated angle. In this note, we study another problem of this genre—a particularly famous such problem. We present a trigonometric solution as well as a ‘pure geometry’ solution.
Item Type: | Articles in APF Magazines | ||
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Authors: | Community Mathematics Centre, CoMaC | ||
Document Language: |
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Uncontrolled Keywords: | Integer degree, sine rule, addition formula for sine, difference formula for cosine, isosceles, equilateral, triangle | ||
Subjects: | Natural Sciences > Mathematics | ||
Divisions: | Azim Premji University > University Publications > At Right Angles | ||
Full Text Status: | Public | ||
URI: | http://publications.azimpremjifoundation.org/id/eprint/1440 | ||
Publisher URL: | http://apfstatic.s3.ap-south-1.amazonaws.com/s3fs-... |
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