That's a difference of 120 degrees.
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Supplementary angles add up to 180 degrees Complementary angles add up to 90 degrees So: 180-60 = 120 degrees
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A triangle with all three angles measuring 60 degrees is called an equilateral triangle.
Providing that it is a regular hexagon then the each interior angle measures 120 degrees and each exterior angle measures 60 degrees
The difference between 275 and 215 is 60.