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11 June, 15:50

In the diagram, all measurements are in centimetres. The lengths of the side of the quadrilateral are 2r+5, 2r, 4r-3 and r. Find an expression, in terms of r, for the perimeter of the quadrilateral. Give your expression in its simplest form.

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  1. 11 June, 16:00
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    The perimeter is simply the sum of all sides so:

    p=2r+5+2r+4r-3+r combine like terms ...

    p=9r+2
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