The midpoints of the sides of the trapezoid are: M ( - 1 , 1 ), N ( 1, - 1 ), P ( 3, 1 ), Q ( 1, 3 ). MN = NP = PQ = QM = √ ( 2² + 2² ) = √ 8 = 2√2 ∠MNP = ∠NPQ = ∠PQM = ∠QMN = 90° Answer: The quadrilateral formed by joining the midpoints of the sides of the trapezoid is a square.
