If the edge length of a cube is a, the sum of its edge lengths is (); if a cuboid is 4.5cm in length, width and height, the sum of its edge lengths is () cm Use two cubes whose edges are 3cm long to form a cuboid. The surface area of the cuboid is (). Hurry!

If the edge length of a cube is a, the sum of its edge lengths is (); if a cuboid is 4.5cm in length, width and height, the sum of its edge lengths is () cm Use two cubes whose edges are 3cm long to form a cuboid. The surface area of the cuboid is (). Hurry!

If the edge length of a cube is a, then the sum of its edge lengths is (12a);
The sum of length, width and height of a cuboid is 4.5cm, and the sum of edge length is (4.5 × 4 = 18) cm
The surface area of this cuboid is (3 × 3 × (12-2) = 90 square centimeter)
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