Here are some examples:
General sense of "around":
* Peri-: This prefix is derived from Greek and often refers to something surrounding or located around another object.
* Examples: perimeter (boundary around an area), pericardium (the sac surrounding the heart)
* Circum-: This prefix also comes from Greek and indicates a surrounding or encircling action.
* Examples: circumference (distance around a circle), circumnavigate (to sail around)
* Ambi-: This prefix comes from Latin and can sometimes imply being on both sides of something, thus surrounding it.
* Examples: ambidextrous (being able to use both hands equally), ambit (the scope or range of something)
Specific senses of "around":
* Peri-: Can also indicate "near" or "close to".
* Circum-: Can indicate "around" in a literal sense, like surrounding an object.
* Circa-: This prefix, from Latin, means "around" or "approximately" in relation to time.
* Examples: circa 1900 (around the year 1900)
Ultimately, the best prefix to use depends on the specific meaning you want to convey and the context of your sentence.