One side of a 5cm square find the perimeter and area.

All sides of a square are equal. The perimeter of a square is the sum of all sides. To find the area of a square, you need to raise the side to the second power. Let us denote the side of the square of the unknown a.
P = a + a + a + a;
P = 5 + 5 + 5 + 5 = 20 cm.
Second way:
P = a * 4;
P = 5 * 4 = 20 cm.
S = a ^ 2;
S = 5 ^ 2 = 25 cm ^ 2.
Answer: P = 20 cm; S = 25 cm ^ 2.