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No, they would need to be bevel gears. Peg gear wheels would but they are generaly made from wood and used for agriculture etc.
it's used to take angle measurement
Proportions are used in real life to determine prices of things.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.
If you are in school and are studying trig then you are using trig in real life.