360o
Fill in the blanks : (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) A diagonal of a quadrilateral is a line segment that joins two ___ vertices of the quadrilateral. (vi) The sum of the angles of a quadrilateral is ___.