The main difference, generally speaking, is that a musical tells a story with song and dance, while a play typically sticks to spoken dialogue. This is a broad generalization; some plays feature musical content, and some musicals feature heavy amounts of spoken dialogue.
Draw every line from the vanishing point. Every line should either be vertical or parallel and completely straight. Remember that you are basically just drawing lines and boxes.
1. true
2. false
3. true
4. I'm pretty sure false