How tall is 170cm? Is 170cm tall?
Whether or not you find 170cm to be tall is pretty subjective. Someone who is 170cm might look short to you, or tall to you, depending on your own height.
If I am 170cm, am I tall or short?
It really depends on your age and the height of the population around you. In some countries 170cm might be considered tall, but in other countries it could be considered short.