This star is made up of 4 equilateral triangles of equal area and a square.
Picture of star formed by one shaded square in the centre, and four unshaded equilateral triangles of equal size arranged around the square. Each equilateral triangle has side lengths that are the same as the side length of the square.
If the area of the shaded region is 9 cm2square centimetres, what is the perimeter of the star?
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