If all of the angles add to 180 degrees the figure is a triangle.
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That is if they form a plane figure.
Angles that add to 1890 degrees are called supplementary angles.
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Supplementary angles add up to 180, complementary on the other hand add up to 90.
They are supplementary angles that add up to 180 degrees
The three interior angles of a triangle add up to 180 degrees.
Up to 3 angles that add to 180 degrees.
The internal angles add up to 360 degrees. If the trapezium has its base parallel to the top then the internal angles on the left of the parallel lines add to 180 degrees, the angles on the right add to 180 degrees.