At 34mins 11sec into the Amazon Prime full-length documentary, the narrator posits that Euclid's assertion that a triangle's interior angles always add up to 180 degrees was later shown as possibly incorrect. A 'triangle' on a sphere's surface is shown, with interior angles as 90+90+90 equaling 270 degrees. However, the latter is a 3D not 2D shape, and so, the documentary is not comparing apples to apples.