31.
The diameter of a circle is equal to the perimeter of a square whose area is 3136 cm2 . What is the circumference of the circle ?

32.
The area of a rectangular field is 2100 sq. meters. If the field is 60 metres long, what is its perimeter ?

33.
How many metres of carpet 63 cm wide will be required to cover the floor of a room 14 metres by 9 metres ?

34.
If the length and breadth of a rectangular field are increased, the area increases by 50%. If the increase in length was 20 %, by what percentage was the breadth increased ?

35.
Total area of 64 small squares of a chessboard is 400 sq. cm. There is 3 cm wide border around the chess board. What is the length of the side of the chess board ?

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