ABCD is a rectangle formed by joining the points A(-1, -1), B(-1, 4), C(5, 4) and D(5, −1). P, Q, R and * are the mid-points of sides AB, BC, CD and DA respectively. Is the quadrilateral PQRS a square? a rectangle? or a rhombus? Justify your answer.
Here all sides of given quadrilateral is of same measure but the diagonals are of different lengths. So, PQRS is a rhombus.
