One side of the triangle is 7 cm, the second is 8 cm, and the third is 4 cm more than the second side.

One side of the triangle is 7 cm, the second is 8 cm, and the third is 4 cm more than the second side. Find the perimeter of the triangle.

Let’s solve this task in steps and explain each of them in detail.
1) 8 + 4 = 12 centimeters – the length of the third side of the triangle, since it is 4 centimeters longer than the second side, and the length of the second side is 8 centimeters;
2) 7 + 8 + 12 = 15 + 12 = 27 centimeters – the perimeter of a triangle with sides of 7 centimeters, 8 centimeters and 12 centimeters.
Answer: The perimeter of the triangle is 27 centimeters.