The perimeter of the rectangle is 17.5 cm. The length of the first side is 0.4 of its perimeter.

The perimeter of the rectangle is 17.5 cm. The length of the first side is 0.4 of its perimeter. The length of the second side is 0.8 times the length of the first side. Find the length of the third side of the triangle.

1. Find out what is the length of the first side of the triangle.
17.5 * 0.4 = 7 centimeters.
2. Find out what is the length of the second side of the triangle.
7 * 0.8 = 5.6 centimeters.
3. Find out what the sum of the first side and the second side of the triangle is equal to.
7 + 5.6 = 12.6 centimeters.
Let’s answer the question of the problem.
4. Find out what is the third side of the triangle.
17.5-12.6 = 4.9 centimeters.
Answer: The third side of the triangle is four point nine centimeters.