The perimeter of the triangle is 40 cm. The length of one side is 18 cm, the length

The perimeter of the triangle is 40 cm. The length of one side is 18 cm, the length of the other is 6 cm less. Find the length of the third side.

To find the length of the third side of a triangle, we will apply the formula to find the perimeter of a triangle.

The perimeter of a triangle is the sum of the lengths of its three sides. The formula looks like this:

P = a + b + c;

The length of one of the sides is 18 cm, and the length of the second is 6 cm less than the first. That is:

18 – 6 = 12 cm.

We also know the perimeter of the triangle. We get the equation:

18 + 12 + x = 40;

x = 40 – 12 – 18;

x = 40 – 30;

x = 10 cm is the length of the third side of the triangle.

Answer: 10 cm is the length of the third side of the triangle.