Lösung 4.2:2f
Aus Online Mathematik Brückenkurs 1
Because the triangle is isosceles (two sides have the same length), it can be divided up into two right-angled triangles of the same size by introducing a side which divides the angle v in half.
If we look at one of the triangles, we can set up the trigonometrical relation
which is an equation for v.
