1. 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 Hint       2. A rectangular carpet has an area of 48 m2 and a perimeter of 28 m. Find the length of its diagonal (in m).   Hint       3. The length of the diagonal of a rectangle is 61 cm and its area is 660 cm2. Find the perimeter (in cm upto two decimal places) of the rectangle.   Hint       4. Find the length (in cm) of the diagonal of a square of area 450 cm2.   Hint       5. 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       6. 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       7. 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