How to find the surface area and the sum of the lengths of the edges of a cube whose edge is 11cm?

There are 12 edges and 6 planes in a cube.

Since all 6 planes are equal squares, then all the edges of the cube are equal.

Therefore, the sum of the lengths of the edges of the cube is:

12 * a, where a is the length of the rib.

12 * 11 = 132 cm.

And the surface area is the sum of the areas of all its 6 surfaces, which means six squares with side a, which is found by the formula:

S = 6 * a ^ 2;

S = 6 * 11 ^ 2;

S = 726 cm2.