Equilateral triangle.
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Triangle has 3 sides, 3 vertices (corners) whose interior angles add up to 180. Octagon has 8 sides, 8 vertices, whose interior angles add up to 1080 degrees. A regular triangle (all sides equal, all angles equal), has interior angles of 60 degrees. A regular octagon (all sides equal all angles equal), has interior angles of 135.
All of the angles in a square are equal, and are 90 degrees.
The interior angles of all quadrilaterals sum to 360 degrees. Since a parallelogram is a quadrilateral, its interior angles must sum to 360 degrees.
The 4 interior angles of a rectangle each measure 90 degrees
Sum of interior angles = (p-2)*180 degrees Sum of exterior angles = 360 degrees You can go further than that only if the polygon is regular. In that case, all the interior angles are equal and each one is (p-2)*180/p degrees; and all the exterior angles are equal and each is 360/p degrees.