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Angles in equilateral triangles The three angles in an equilateral triangle are equal and they add up to 180 ∘. To find the size of each of these angles divide 180 by 3. 180 ÷ 3 = 60 ∘ ...
Ivo G. Rosenberg, Frank Stenger, A Lower Bound on the Angles of Triangles Constructed by Bisecting the Longest Side, Mathematics of Computation, Vol. 29, No. 130 (Apr., 1975), pp. 390-395 ...
A Maths article on how to calculate angles in triangles.
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