How do the following things relate to trigonometry?

How does similarity relate to trigonometry?
How does ratio relate to trigonometry?
How does sine, cosine, and tangent relate to trigonometry?
How does adjacent, opposite, and hypotenuse relate to trigonometry?


Bonus question: Why do sine and cosine have a max value of 1?


Thanks so much!

Welcome to the forum.

Maybe you can write your versions of answers and we can discuss them. See rule #11 in this thread.