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Multiple choice

A sector of circle of radius $15\ cm$ has the angle $120^{o}$. It is rolled up so that two bounding radii are joined together to form a cone. The height of the cone is

  1. $5\sqrt{2}\ cm$
  2. $2\sqrt{2}\ cm$
  3. $10\sqrt{2}\ cm$
  4. $20\sqrt{2}$
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