you always add on 180 degrees
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The sum of the three angles is 180 degrees. There are other relationships that can be derived from this.
The sum of the interior angles of a triangle is equal to 180 degrees.
112.5 degrees
They both add up to 180 degrees when on a staight line.
The internal angles of a quadrilateral (a plane figure with four straight sides) is 360 degrees, whatever the relationship between the sides.