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Step 1: Identify the coordinates of the vertices of the rhombus.

Step 2: Calculate the coordinates of the midpoints of the sides. x-coordinate of midpoint = average of x-coordinates of the two end points, and similarly the y- coordinate.

Step 3: Calculate lengths of sides of the quadrilateral formed (using Pythagoras)

Step 4: Use step 3 results to show opposite sides are equal.

Step 5: Calculate gradient (slope) of any two adjacent sides, if defined.

Step 6: The two gradients multiply to -1 which shows that they are perpendicular.

4 and 6 prove that the quadrilateral is a rectangle.

If a side of the quadrilateral is vertical, its gradient (step 5) is not defined, but then the adjacent side will be horizontal. And so the two sides are perpendicular.

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Q: Using coordinate geometry how can you prove that the midpoints of the sides of a rhombus determine a rectangle?
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