question_answer 3)

                What is the sum of the measures of the angles of a convex quadrilateral? Will this property hold if the quadrilateral is not convex? (Make a non-convex quadrilateral and try!)

Answer:

                The sum of the measures of the angles of a convex quadrilateral is \[{{360}^{o}}\]. Yes! this property will hold if the quadrilateral is not convex.