Every triangle always has to have a total of 180 degrees
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In total, a triangle has 180 degrees.
By definition, a triangle must have three angles. It is also known that the interior angles of a triangle must total 180 degrees. If a triangle contained a single interior angle of 180 degrees, the other angles of the supposed triangle would both have to be zero, and the supposed triangle would be a straight line.
180 DEGREES
The 3 inside angles of a triangle add up to 180 degrees
The interior angles of a triangle always add up to 180 degrees.