> 
> If it is given to you that
> $$\sin\theta = \frac{3}{\sqrt{73}}$$
> then how will you find this angle quickly?
> 
> 
> 

So you can imagine that real diagram is like this

[![enter image description here](https://i.stack.imgur.com/6hOl4.jpg)](https://i.stack.imgur.com/6hOl4.jpg)

The thing is to find that angle $\theta$.

> 
> Also, my teacher assumed it intuitively that $\theta$ is less than $37^\circ$. What is the way to do that?
> 
> 
>