What is the surface area of a cube whose edge is 9 cm, find the sum of the lengths of all its edges?

Find the area of ​​the base of the cube, which is a square, for this you need to square the value of its edge:

92 = 81 cm2 is the base area of ​​this cube.

Let’s find the area of ​​the entire surface of a given cube, for this, the area of ​​the base of the cube must be multiplied by the number of surfaces of the cube:

81 * 6 = 486 cm2 – the area of ​​the entire surface of the cube.

Find the sum of the lengths of all the edges of the cube, for this you need to multiply the value of the edge of the cube by the number of edges in the cube, that is, twelve:

9 * 12 = 108 cm – the length of all the edges of this cube.

Answer: 486 cm2 is the area of ​​the entire surface of this cube, 108 cm is the length of all the edges of this cube.