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 breadth of a lawn in the shape of a rectangle is ¼th its length. If the perimeter of the plot is 320 m, find its area (in 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. Find the length (in cm) of the diagonal of a square of area 450 cm2.   Hint       5. A rectangle of area 180 m2 and perimeter 56 m has its length equal to x m. Find its length (in m).   Hint       6. The length of the diagonal of a square is 24 cm. Find its area (in cm2).   Hint       7. 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