Draw two lines which intersect at a right angle. From the intersection point measure the same distance along each line and in both directions. Join the 4 resulting dots. What shape did you get?

The diagonals of a square: 1) are of equal length 2) bisect each other (intersect at their midpoints) 3) intersect at a right angle Which of these conditions can we relax for rectangles?

The diagonals of a rectangle: 1) are of equal length 2) bisect each other (intersect at their midpoints)

What happens to a rectangle if we keep the length Of opposite sides the same but vary the angles? What happens to a square if we keep all sides of equal length but vary the angle?

A parallelogram is a quadrilateral in which opposite sides have equal length A rhombus is a quadrilateral in which all sides have equal length