Theatre – le théâtre
(Pronounced tay-ah-truh)
To remember that Theatre is pronounced tay-ah-truh (théâtre) in French, use the following mnemonic:
Whenever I go to the theatre, I always take a trumpet (théâtre).

Théâtre is masculine, so it's le théâtre. Imagine the early learner in the Globe Theatre performing Shakespeare.

Examples of théâtre (theatre) in a sentence
Le théâtre est situé en face du restaurant.
(The theatre is located across from the restaurant.)
Il a étudié le théâtre classique à l'université.
(He studied classical theatre at the university.)
Nous allons au théâtre ce soir.
(We are going to the theatre tonight.)