What is the time taken by a person to cover one round of a circular park of diameter 210 m if he walks at a speed of 6 km/hr? (Take π = 22/7)

The circumference of a circle exceeds the diameter by 16.8 cm. What is the diameter of the circle? (Take π = 22/7)

A toy is in the form of a cone mounted on a hemisphere of diameter 7 cm. The total height of the toy is 14.5 cm. Then the volume of the toy is (π=22/7):

The diameter of a copper sphere is 6 cm. The sphere is melted and is drawn into a long wire of uniform circular cross-section. If the length of the wire is 36 cm, then its radius is

How long will a man take to walk around the boundary of a square field of area 25 hectares at the rate of 5 km/hr ?

The area of a rhombus is 96 square cm and one of its diagonals is of length 12 cm. What is the perimeter of the rhombus ?