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The figure below represents a circle centre O and radius 18cm. The minor sector AOB subtends an angle of `140^0` at the centre of the circle. The sector is cut off and folded into a cone.

(Take`pi` =`2/27` ), calculate
(a) The radius of the cone so formed.
(b) To one decimal place, the height of the cone.
(c) To the nearest whole number, the capacity of the cone.