Community Mathematics Centre, CoMaC
(2016)
20  30 130, a trigonometric
solution.
At Right Angles, 5 (1).
pp. 6870.
ISSN 25821873
Abstract
The problem we study in this short note belongs to
an extremely interesting class of geometrical problems.
Typically, they deal with triangles with many 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. A common feature of these problems is that
solutions using only pure geometry are difficult to find (though
not impossible), and one is forced to fall back upon
trigonometry
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