If you triple your distance from an object, its angular size decreases to one-third of its original size.

Here's why:

* Angular size is how large an object appears in your field of view. It's determined by the ratio of the object's actual size to its distance from you.

* Tripling the distance means the denominator in this ratio (distance) increases by a factor of 3.

* This proportionally reduces the angular size to one-third of its original value.

Think of it like looking at a coin:

* Hold it close to your eye, and it appears large (large angular size).

* Move it further away, and it appears smaller (smaller angular size).