# The edge of the cube is 15 cm find 1) the sum of the lengths of all the edges of the cube 2) surface area

July 27, 2021 | education

| To solve this problem, remember that a cube is a rectangular parallelepiped, all the faces of which are squares. All the edges of a cube are equal. Proceeding from this, a1 = a2 = a3 = a4 = 15.

the sum of the lengths of all the edges of the cube 4a = 4 * 15 = 60 cm.

The surface area of a cube is equal to the sum of the areas of its six faces, i.e. area of a square with side a times six. The surface area of a cube is:

S = 6a ^ 2

S = 6 * 12 ^ 2 = 6 * 12 * 12 = 864 cm ^ 2

Answer: 864 cm ^ 2

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.