How tall is 178cm? Is 178cm tall?
Whether or not you find 178cm to be tall is pretty subjective. Someone who is 178cm might look short to you, or tall to you, depending on your own height.
If I am 178cm, am I tall or short?
It really depends on your age and the height of the population around you. In some countries 178cm might be considered tall, but in other countries it could be considered short.