180 degrees minus interior angle = exterior angle and that the 3 exterior angles of a triangle add up to 360 degrees.
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It forms a linear pair with one of the interior angles of the triangle
That it must be a right angle triangle because the 3rd angle must be 90 degrees
That it has a 90 degree angle and two equal 45 degree angles
false
An obtuse triangle has 1 obtuse angle and 2 acute angles which add up to 180 degrees.
false