The angle between adjacent sides of a rectilinear figure.
- At each vertex of a triangle there is a couple of angle bisectors: a bisector of the interior angle and a bisector of the exterior angle.
- Hall apparently is ignorant of spherical trigonometry where the sum of the interior angles of every triangle exceeds 180 degrees.
- Most antique bow compasses have an interior angle between the cross piece and bow arm of 70 to 75 degrees.
Definition of interior angle in:
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