Find the perimeter of the triangle ABC, if AB = 2.8 cm, BC is more than AB by 0.8 cm, but less than AC by 1.1 cm.

In order to answer the question of the problem, you need to know what each side of the triangle is equal to, since the perimeter of the triangle is equal to the sum of its three sides.
1. Find out what the side of the BC triangle is.
2.8 + 0.8 = 3.6 centimeters.
2. Let’s find what the side of the AC of the triangle is equal to.
3.6 + 1.1 = 4.7 centimeters.
Let’s answer the question of the problem.
3. Find what the perimeter of this triangle is.
2.8 + 3.6 + 4.7 = 11.1 centimeters.
Answer: The perimeter of this triangle is eleven point one-tenths of a centimeter.