The total length of all the edges of the cube is 840 cm. We calculated the area of one face of the cube.

The total length of all the edges of the cube is 840 cm. We calculated the area of one face of the cube. We calculated the total area of all the faces of the cube.

A cube is a polyhedron in which each face is a square. In total, the cube has 6 equal faces and 12 edges. Let’s calculate what the length of one edge is, knowing that the sum of the edges is 840 cm.

840/12 = 70 cm.

Let’s calculate what is the area of one face, knowing that the length of the side is 70 cm. The area of a square is equal to the square of its side.

S = 70 * 70 = 4900 cm².

Let’s calculate what the sum of the areas of the cube faces is equal to.

4900 * 6 = 29400 cm².

Answer: 29400 cm².