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never In non-Euclidean geometry triangles can have angles that are more or less than 180 degrees.
In an equilateral trianger, each angle is 60 degrees. In all triangles, including equilateral triangles, all 3 angles add up to 180 degrees.(the above assumes Euclidean - flat - space. In Hyperbolic space there are less than 180° in all triangles; in Spherical space more than 180° in all triangles)
180 degrees
A hexagon has 6 triangles inside of it. If one triangle equals 180 degrees and there are 6 triangles. 180 degrees *6 triangles=1080 degrees.
3 triangles because there are 540 degrees in a pentagon and 180 degrees in a triangle so 3*180 = 540 degrees