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Because the system of measuring degrees is out of 360 and centered around the the angle created by a circle and the mathematical equation about the sum interior angles of any polygon is equal to (n-2)180 where n is the number of sides. A triangle has 3 sides. 3 minus 2 is 1 and 1 times 180 is 180.

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13y ago
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Q: Why is the sum of the angles of a triangle 180?
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