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    This from the 2012 Paper 2 and I am struggling with how to do it?

    4.The design in the diagram is formed from four circles which all touch at the top of the shape (the
    diagram is not to scale).
    The diameter of the smallest circle is d, the second is 2d, the third is 3d and the largest is 4d.
    Find an expression for the area of the shading in the design
 
 
 
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