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. 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       3. 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       4. The length of the diagonal of a square is 24 cm. Find its area (in cm2).   Hint       5. Find the length (in cm) of the diagonal of a square of area 450 cm2.   Hint       6. The perimeter of a rectangle is 96 m and its breadth is 14 m. Find its area (in m2).   Hint       7. The length of the diagonal of a square is 30√2 cm. Find its perimeter (in cm).   Hint