Since I’m not that good at mathematics, I have always liked concepts like the dragon ratio and golden curve, which are easy to understand and explain but they are also mathematically beautiful at the same time.

Do you know some other concepts like these?

**Answer**

I think if you look at this animation and think about it long enough, you’ll understand:

- Why circles and right-angle triangles and angles are all related.
- Why sine is “opposite over hypotenuse” and so on.
- Why cosine is simply sine but offset by \(\pi\over 2\) radians.

**Attribution**

*Source : Link , Question Author : Community , Answer Author : Community*