The length of the edge of the cube is 5 cm, find the perimeter of its face.

Given:
AVSKA1V1S1K1 – cube,
AB = 5 centimeters.
Find the perimeter of the face АВСК -?
Decision:
Consider the cube АВСКА1В1С1К1. All edges of a cube are equal to each other. Hence the squares are the face of the cube. The perimeter of a square is the sum of all its sides, that is, the side of the square must be multiplied by 4. We get:
P avsk = 4 * AB;
R avsk = 4 * 5;
R avsk = 4 * 5;
Ravsk = 20 centimeters – the perimeter of the ABSK face.
Answer: 20 centimeters.