Mensuration

A solid metallic hemisphese having radius R is melted and recasted as a cone with the same base radius R. If H is the height of the cone so formed, then the relation between H and R is:

The diameter of a solid right circular cone is 14cm and its slant height is 10cm.The rate of colouring of the cone is ₹I4/cm² .The cost of colouring :
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A horse is tied to a pole by a rope. If the horse move along a circular path always keeping the rope stretched and describes 22 m when it has traced 56° at the centre. The length of the rope is (Usе )