1. The area of a square field is 18 hectares. How much distance (in m) does a man have to cover to cross it diagonally? Note that 1 hectare = 10000 m2.   Hint Hint       2. The length of a rectangle is 20 m and its breadth is 15 m. If the length is increased to 30 m, what will be the breadth (in m) of the rectangle given that the area remains the same?   Hint       3. Find the area (in m2) of a swimming pool in the shape of a rectangle whose one side measures 15 m and the length of whose diagonal is 25 m.   Hint       4. The length of a rectangular hall is 10 m more than its breadth. The area of the hall is 875 m2. Find its length (in m).   Hint       5. The length of the diagonal of a square is 24 cm. Find its area (in cm2).   Hint       6. A rectangular carpet has an area of 48 m2 and a perimeter of 28 m. Find the length of its diagonal (in m).   Hint       7. A corridor is 15 m long and 8 m broad. Find the cost (in $) of carpeting it with a carpet 60 cm long at 4 per meter.   Hint