1. A cuboid of dimensions 120 cm × 60 cm × 30 cm is melted and recast into a cube. Find the total surface area (in cm2) of the cube.   Hint Hint       2. Find the total surface area (in m2) of a cube of side 15 m.   Hint       3. Find the lateral surface area (in m2) of a cuboid 8 m long, 60 cm broad and 5 m high.   Hint       4. The sum of the length, the breadth and the height of a cuboid is 17 cm and the length of its diagonal is 13 cm. Find the total surface area (in cm2) of the cuboid.   Hint       5. Four cubes, each of side 4 cm are joined end to end. Find the total surface area (in cm2) of the resultant cuboid.   Hint       6. The length of the diagonal of a cube is 14 √3 cm. Find its total surface area (in cm2).   Hint       7. Find the total surface area (in m2 upto one decimal place) of a cuboid 8 m long, 4 m broad and 70 cm high.   Hint