The length of the first side of the triangle is 18 cm. The second is three times less

The length of the first side of the triangle is 18 cm. The second is three times less, and the length of the third side is 14 cm. Find the perimeter of this triangle.

Given a triangle, with sides (let’s say) a, b, c. We know two sides a = 18 cm, c = 14 cm. Side b is not known to us, but by the problem statement it is 3 times smaller than side a.
In order to find the Perimeter of a triangle, you need to know all the dimensions of the sides, which means we calculate the side b:
18: 3 = 6 (see)
According to the formula, the perimeter of a triangle:
P = a + b + c
We calculate in a simple mathematical way, substituting numbers into the formula:
P = 18 + 6 + 14
P = 38 (see)