Type the root word for trilogy.
trilogy
What is the root word for trilogy?

The English prefix tri-, derived from both Greek and Latin, means “three.” Some common English vocabulary words that contain this prefix include triathlon, trio, and triangle. The word originates from the Greek word trilogia, meaning "series of three related tragedies performed at Athens at the festival of Dionysus." Today, you can use trilogy to describe three of anything, such as a trilogy of movies that has the same characters, settings, and themes.

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explanation:

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.