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Simple geometry Help Please

Last question on here:
http://store.aqa.org.uk/qual/gceasa/qp-ms/AQA-MFP3-W-QP-JAN06.PDF
http://store.aqa.org.uk/qual/gceasa/qp-ms/AQA-MFP3-W-MS-JAN06.PDF

I have done everything, meaning found that the polar co-ordinates are (6,pi/6) and (6,5pi/6), I have even drawn the quadrilateral but just can't seem to workout how to get the area.
I haven't a clue what a rhombus is tbh and what the difference between it and a square is.

In the below diagram to get the area of the quadrilateral why can't I just use 6^2 = 36 because it's just a square right ?

Diagram posted next post.

Thnx
(edited 11 years ago)
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A rhombus is a square with slanted sides. All those sides have length 6 and so does OM. The area of the rhombus equals the area of the triangle OMP plus the area of OMQ. Both triangles are equilaterial and have sides 6.

edit: The reason you can't do 6x6 is that it isn't a square. Since the shape is comprised of two equilaterial triangle stuck together, the angles in the shape aren't 90 degrees.
(edited 11 years ago)

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