Wie groß ist die Hand von einem 196cm Mann?

That’s different. Body size and size of hands and feet do not necessarily have to do with each other when you have grown up.

As an example, my little brother is about 196cm tall and has excavator blades as hands and boats as feet.

I’m 187cm tall and have tiny hands and feet compared. My big brother is smaller than me with 178cm and he has far bigger hands than me. Even my little sister has 168cm bigger hands than I 😂😅

I’m the second largest, but I have the second smallest hands. It is therefore not possible to say how large a person’s hands are.