What is the definition for interior angle?
An interior angle of a 2-dimensional plane shape is an angle on its perimeter that is facing the enclosed area of the shape.An interior angle of a 2-dimensional plane shape is an angle on its perimeter that is facing the enclosed area of the shape.An interior angle of a 2-dimensional plane shape is an angle on its perimeter that is facing the enclosed area of the shape.An interior angle of a 2-dimensional plane shape is an angle on its perimeter that is facing the enclosed area of the shape.