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A sector of a circle of radius 21 cm with central angle 120° is folded into a cone. Find the height of the cone.

Competition practiceMensuration
  • A7√2 cm
  • B14√3 cm
  • C14√2 cm
  • D7√3 cm

Step-by-Step Solution

Arc ; slant 21. cm.
Answer: C) 14√2 cm

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