How many centimeters is the perimeter of triangle ABC, if the AC side is 18dm, the BC

How many centimeters is the perimeter of triangle ABC, if the AC side is 18dm, the BC side is 8cm less than AC, and AB. 2 times less aircraft?

The perimeter of triangle ABC is:

P = AB + BC + AC.

So far we only know the AC side. You need to find AB and BC. It is known that BC is 8 cm less than the side AC, we find it:

BC = 18 dm – 8 cm = 18 dm – 0.8 dm = 17.2 dm.

It is known that AB is 2 times less than BC, we find it as well:

AB = 17.2 / 2 = 8.6 dm.

We can now find the perimeter of triangle ABC:

P = 18 + 17.2 + 8.6 = 43.8 dm.

Answer: The perimeter of triangle ABC is 43.8 decimeters.