Angles of a triangle (α + β+ γ = 180°)

From Oxford Mathematics

Robin Wilson's second short talk on the equations that make mathematics stars the man whose work was studied in universities and schools for over 2000 years. Apparently Lewis Carroll for one was miffed when alternatives were used. α + β+ γ = 180° starring Euclid. You can watch other episodes in the series here: https://www.youtube.com/playlist?list=PL4d5ZtfQonW0yqeFK__FirrjjmcQFpyye Robin's book 'Sum Stories: Equations and their origins' is available here: https://www.amazon.co.uk/Sum-Stories...