One side of the triangle is 12 cm, the second side is 3 times larger than the first, and the third is 8 cm

One side of the triangle is 12 cm, the second side is 3 times larger than the first, and the third is 8 cm less than the second. Find the perimeter of the triangle.

1) Find the value of the second side of the triangle: 12 • 3 = 36 (cm);
2) We calculate the value of the third side of the triangle: 36 – 8 = 28 (cm);
3) Calculate the perimeter of the triangle using the formula: P = a + b + c = 12 +36 + 28 = 76 (cm).
Answer: the perimeter of the triangle is 76 cm.