Which statement can be concluded using the true statements? if a quadrilateral has 4 equal sides and 4 equal angles, then it is a square. if a figure is a square, then each of its angles must measure 90 degrees. a) if a quadrilateral has 4 equal sides and 4 equal angles, then each of its angles must measure 90 degrees. b) if a quadrilateral has 4 equal sides and 4 equal angles, then none of its angles measures 90 degrees. c) if all four angles in a quadriateral measure 90 degrees, the quadrilateral is a square. d) if all four angles in a quadriateral measure 90 degrees, the quadrilateral cannot be a square.