The parallelogram shown in the diagram has been divided into nine smaller parallelograms. The perimeters, in centimetres, of four of the smaller parallelograms are shown. The perimeter of is 21cm. What is the perimeter of the shaded parallelogram?
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5 \text{ cm}
6 \text{ cm}
7 \text{ cm}
8 \text{ cm}
9 \text{ cm}
Select an option, then submit.
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