Calculate the distance of an object based on its size My problem is this:

There is an object whose height is $30$cm. At some distance it looks like it is $0.5$cm high. Can I calculate the distance based on this information?

Thanks in advance.
My interpretation:

If the height is h, the distance is d, and it looks like k,
then h/d = k.

What do you mean by "looks like"?
My interpretation:

If the height is h, the distance is d, and it looks like k,
then h/d = k.

What do you mean by "looks like"?