The length of each of the two sides of the triangle is 3 cm and the third x cm.

The length of each of the two sides of the triangle is 3 cm and the third x cm.Write as an expression I the perimeter of the triangle, in which the length of the 3rd side is 4 times less than that of this triangle

The perimeter of a triangle is the sum of the lengths of its three sides. P = a + b + c

By the condition of the problem: a = 3 cm, b = 3 cm, c = x cm

Hence it follows: the perimeter of the given triangle in the condition is:

P = 3 + 3 + x (cm)

Further, according to the condition of the problem, the length of the first two sides remains unchanged, and the third has decreased by 4 times, which means a = 3 cm, b = 3 cm, c = x: 4 cm

As a result, the perimeter of the new triangle can be written as follows:

P = 3 + 3 + (x: 4) (cm)