Circle — Centre, radius, diameter, arc, sector, chord, segment, semicircle circumference, interior andexterior.

Quadrilateral — Sides, vertices, angles, diagonals, adjacent sides and opposite side (only convex quadrilateral are to be discussed), interior and exterior of a quadrilateral.

Triangle — vertices, sides, angles, interior and exterior, altitude and median

Angle — Vertex, arm, interior and exterior,

Curvilinear and linear boundaries

Interior and exterior of closed figures.

Open and closedfigures.

Line, line segment, ray.