Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Q: Derived from the Greek word meaning perimeter, what is the text form of the sixteenth letter of the Greek alphabet?

A: pi
****
Q: March 28, 1987 saw the death, at age 82, of one Maria von Trapp, who was the inspiration behind what Rogers and Hammerstein musical?

A: the sound of music
****
Q: Which actor played Alex in the TV show `Family Ties`?

A:
michael j fox
****