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UKMT Junior Kangaroo, 2019

Algebra Difficulty 2.0 Junior Find the answer United Kingdom

The shape in the diagram is made up of a rectangle, a square and an equilateral triangle, all of which have the same perimeter. The length of the side of the square is 9 cm. What is the length of the shorter sides of the rectangle?

(A) $4$ cm (B) $5$ cm (C) $6$ cm (D) $7$ cm (E) $8$ cm

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