One side of the triangle is 11.5 cm, it is 0.6 cm less than the second side and 0.9 cm more

One side of the triangle is 11.5 cm, it is 0.6 cm less than the second side and 0.9 cm more than the third. What is the perimeter of the triangle?

1) Let’s find out how long the second side of the triangle has, if it is known that it is 0.6 cm longer than the first side. and the first side is 11.5 cm long.

11.5 + 0.6 = 12.1 cm.

2) We find out how long the third side of the triangle is, if we know that it is 0.9 cm shorter than its first side, and the first side is 11.5 cm long.

11.5 – 0.9 = 10.6 cm.

3) Find out what perimeter this triangle has, if we found the lengths of the milestones of the sides.

11.5 + 12.1 + 10.6 = 34.2 cm.

Answer: The perimeter of the triangle is 34.2 cm.