How i can solve the problem of ncert class 10 coordinate geometry question easily . What is the best way to solve the exercise 7.4 question no.8 easily , please give me easy solution for this question. ABCD is a rectangle formed by the points A (-1, – 1), B (-1, 4), C (5, 4) and D (5, -1). P, Q, R and S are the midpoints of AB, BC, CD and DA respectively. Is the quadrilateral PQRS a square? a rectangle? or a rhombus? Justify your answer.