# The length of one side of a triangle is five twelfths of its perimeter, and the length of the other side is four

**The length of one side of a triangle is five twelfths of its perimeter, and the length of the other side is four twelfths of the perimeter. Find the length of two sides of the triangle if the third side is 5.4 cm.**

The solution of the problem:

1. Let us determine what the sum of the ghost parts of the lengths of the two sides of the triangle, which they make up from its perimeter, is equal to.

5/12 + 4/12 = 9/12 = 3/4;

2. Find out what part of the perimeter of the triangle is the third side.

1 – 3/4 = 1/4;

3. Find out how many centimeters are in one part.

5.4: 1/4 = 5.4 * 4 = 21.6 centimeters.

4. What is the length of one side of the triangle?

21.6 * 5/12 = 9 centimeters.

5. What is the second side of the triangle?

21.6 * 4/12 = 7.2 centimeters.

Answer: One side of the triangle is 9 cm. The other side is 7.2 cm.