The 3 interior angles of a triangle add up to 180 degrees
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All the angles in ANY triangle [on a plane surface] add up to 180 degrees.
The internal angles of any triangle add up to 180 degrees.
The interior angles of a triangle all add up to 180 degrees.
Interior angles of all triangles add up to 180 degrees.
All three angles in a scalene triangle add up to 180 degrees.