Complete each of the following, so as to make a true statement:
(i) A quadrilateral has ______sides.:
(ii) A quadrilateral has ______angles.:
(iii) A quadrilateral has ______vertices, no three of which are ______:
(iv) A quadrilateral has ______diagonals.:
(v) The number of pairs of adjacent angles of a quadrilateral is ______:
(vi) The number of pairs of opposite angles of a quadrilateral is ______:
(vii) The sum of the angles of a quadilateral is ______:
(viii) A diagonal of a quadrilateral is a line segment that joins two ______vertices of the quadrilateral.:
(ix) The sum of the angles of a quadrilateral is ______ right angles. :
(x) The measure of each angle of a convex quadrilateral is ______ 180 ∘ .:
(xi) In a quadrilateral the point of intersection of the diagonals lies in ______ of the quadrilateral.:
(xii) A point is in the interior of a convex quadrilateral, if it is in the ______ of its two opposite angles.:
(xiii) A quadrilateral is convex if for each side, the remaining ______ lie on the same side of the line containing the side.