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Because the formula for finding the total interior angles of any polygon is;

(Number of sides - 2)*180 = sum of interior angles

A triangle has 3 sides so: (3 - 2)*180 = 180 degrees

A quadrilateral has 4 sides so: (4 - 2)*180 = 360 degrees

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Q: Why does a triangle equal to 180 degreest?
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