1. 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 Hint       2. A rectangle of area 180 m2 and perimeter 56 m has its length equal to x m. Find its length (in m).   Hint       3. 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       4. The difference between the length and the breadth of a rectangle is 25 m. If its perimeter is 210 m, find its area (in m2).   Hint       5. Find the length (in cm) of the diagonal of a square of area 450 cm2.   Hint       6. 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       7. The length of the diagonal of a square is 30√2 cm. Find its perimeter (in cm).   Hint