In the circle, the angle labelled x is a right angle. The grey part is $$\frac{1}{5}$$ of the whole circle and the other white part is $$\frac{7}{20}$$ .
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In the circle, the angle labelled x is a right angle. The grey part is $$\frac{1}{5}$$ of the whole circle and the other white part is $$\frac{7}{20}$$ .