1. Find the total surface area (in m2) of a cube of side 15 m.   Hint Hint       2. 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       3. 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       4. The area of the square on the diagonal of a cube is 1452 cm2. Find the total surface area (in cm2) of the cube.   Hint       5. Two cubes, each of volume 729 cm3 are joined end to end. Find the total surface area (in cm2) of the resultant cuboid.   Hint       6. Find the lateral surface area (in m2) of a cuboid 8 m long, 60 cm broad and 5 m high.   Hint       7. Four cubes, each of side 4 cm are joined end to end. Find the total surface area (in cm2) of the resultant cuboid.   Hint