Quadrilateral Geometry Quiz

Tetragon = Derived from Greek 'tetra' meaning 'four' and 'gon' meaning 'corner' or 'angle' Quadrangle = Analogously called a 4-angle Simple quadrilateral = A quadrilateral that is not self-intersecting Convex quadrilateral = All interior angles are less than 180° and the two diagonals both lie inside the quadrilateral

Quadri = A variant of four Latus = Meaning 'side' Gon = Meaning 'corner' or 'angle' Tetra = Meaning 'four'

Sum of interior angles of a simple quadrilateral = $\angle A + \angle B + \angle C + \angle D = 360^\circ$ Special case of the n-gon interior angle sum formula for a quadrilateral = $S = (n - 2) \times 180°$ Non-self-crossing quadrilaterals property = Tile the plane by repeated rotation around the midpoints of their edges Complex quadrilaterals property = Self-intersecting or crossed

◻ ABCD = Denotation for a quadrilateral with vertices A, B, C, and D ∠ = Symbol for an angle S = Sum of interior angles in a polygon n-gon = General term for a polygon with n sides

Latin = Derivation of words like quadri and latus used in geometric terminology Greek = Derivation of words like tetra and gon used in geometric terminology Analogous terminology usage = Quadrangle, derived from Latin and Greek roots, used in geometry terminology Modern language usage = Terms like simple, convex, and complex used to describe geometric properties