The 3 interior angles of a triangle add up to 180 degrees
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An interior angle is any angle on the interior of the triangle.
Either could have a larger interior angle. If they were regular, then the interior angle of a triangle would be 60 degrees whereas that of a heptagon would be 128.57 degrees. The REGULAR heptagon would have a larger interior angle than a REGULAR triangle.
It is: 180-interior angle = exterior angle
The sum of the interior angles of a triangle on a plane is always 180 degrees.
No. It is equal to the sum of the opposite interior angles.