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The difference of the circumference of two circles is 66 cm. If the diameter of bigger circle is 28 cm, then the diameter of the other circle is cm

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$D i f f e r e n c e o f c i r c u m f e r e n c e o f t w o s e m i c i r c l e s = 66 c m π (D - d) = 66 28 - d = \frac{66 \times 7}{22} = 21 d = 28 - 21 = 7 c m$

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