180 degrees.
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The interior angles of a triangle add up to 180 degrees. The exterior angles of a triangle add up to 360 degrees.
Angles in a triangle add up to 18010 which is 13012
The Interior angles of a triangle add up to 180° The Exterior angles of a triangle (or any other polygon) add up to 360°.
180 degrees, if the triangle is on a flat surface.
The sides can add up to any number. The angles, however, always add up to 180o.