One side of the triangle is 6 cm and the other side is 60% of the first side. The third side is 1.4 cm shorter than the first side.

Determine the length of the second side.

Since it is 60% of the length of the first, to determine it, you need to multiply the length of the first side by a percentage.

We get:

6 * 60% / 100% = 6 * 0.6 = 3.6 cm (second side).

We find the third side.

Since it is 1.4 cm smaller than the first side, we get:

6 – 1.4 = 4.6 cm (third side length).

Find the perimeter of the triangle.

To do this, we summarize the value of each side.

We get:

6 + 4.6 + 3.6 = 14.2 cm.

Answer: The perimeter of the triangle is 14.2 cm.